c) $$ \left(x^{3}-2 x+1\right)+\left(-7 x^{3}+3 x^{2}-6 x\right) $$

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Calculate or simplify the expression $$ (x^3-2x+1)+(-7x^3+3x^2-6x) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(x^{3}-2x+1\right)+\left(-7x^{3}+3x^{2}-6x\right)$$
- step1: Remove the parentheses:
  $$x^{3}-2x+1-7x^{3}+3x^{2}-6x$$
- step2: Subtract the terms:
  $$-6x^{3}-8x+1+3x^{2}$$
The simplified expression is $$ -6x^{3}-8x+1+3x^{2} $$.
The simplified expression is $$ -6x^{3}+3x^{2}-8x+1 $$.

c)

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