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Solve for x . \[ \frac{3 x+5}{18}+\frac{3 x-7}{9}=x+6 \]

Ask by Reid Craig. in the United States
Feb 14,2025

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Answer

\( x = -13 \)

Solution

First, note the given equation:   (3x + 5)/18 + (3x - 7)/9 = x + 6 Step 1. Express both fractions with a common denominator. Since 9 is a factor of 18, rewrite (3x - 7)/9 as (2(3x - 7))/18:   (3x + 5)/18 + (2(3x - 7))/18 = x + 6 Now combine the numerators:   (3x + 5 + 6x - 14)/18 = x + 6   (9x - 9)/18 = x + 6 Step 2. Simplify the left-hand side. Factor the numerator:   9(x - 1)/18 = (x - 1)/2 So the equation becomes:   (x - 1)/2 = x + 6 Step 3. Solve for x by eliminating the denominator. Multiply both sides by 2:   x - 1 = 2(x + 6)   x - 1 = 2x + 12 Step 4. Rearrange to isolate x:   x - 1 - 2x - 12 = 0   -x - 13 = 0   -x = 13   x = -13 Thus, the solution is x = -13.

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The Deep Dive

Let's solve the equation step by step. First, we'll rewrite the equation for clarity: \[ \frac{3x + 5}{18} + \frac{3x - 7}{9} = x + 6 \] To eliminate the fractions, we can find a common denominator. The common denominator for 18 and 9 is 18. We can rewrite the second term: \[ \frac{3x - 7}{9} = \frac{2(3x - 7)}{18} = \frac{6x - 14}{18} \] Now we can substitute this back into the equation: \[ \frac{3x + 5}{18} + \frac{6x - 14}{18} = x + 6 \] Combining the fractions on the left side: \[ \frac{(3x + 5) + (6x - 14)}{18} = x + 6 \] This simplifies to: \[ \frac{9x - 9}{18} = x + 6 \] Now simplify the left side: \[ \frac{9(x - 1)}{18} = x + 6 \implies \frac{x - 1}{2} = x + 6 \] Next, multiply both sides by 2 to eliminate the fraction: \[ x - 1 = 2(x + 6) \] Distributing the 2 on the right side: \[ x - 1 = 2x + 12 \] Now, isolate x by moving all x terms to one side and the constant terms to the other side: \[ x - 2x = 12 + 1 \] This simplifies to: \[ -x = 13 \implies x = -13 \] Thus, the solution for x is: \[ \boxed{-13} \]

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