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Bonus Knowledge
To solve the equation \( \frac{x-4}{4}-\frac{x-5}{36}=\frac{x+5}{9} \), first find a common denominator. The least common multiple of 4, 36, and 9 is 36. Multiply each term by 36 to eliminate the fractions: \[ 36 \left( \frac{x-4}{4} \right) - 36 \left( \frac{x-5}{36} \right) = 36 \left( \frac{x+5}{9} \right) \] This simplifies to: \[ 9(x-4) - (x-5) = 4(x+5) \] Distributing each term gives: \[ 9x - 36 - x + 5 = 4x + 20 \] Combine like terms: \[ 8x - 31 = 4x + 20 \] Now, isolate \(x\) by moving all \(x\) terms to one side and constant terms to the other: \[ 8x - 4x = 20 + 31 \] This simplifies to: \[ 4x = 51 \] Finally, divide both sides by 4 to isolate \(x\): \[ x = \frac{51}{4} = 12.75 \] So the solution to the equation is \( x = 12.75 \).
