Question
Simplify:
$x^4-6 x^3+2 x-7+7 x^3-x+5 x^2+2-x^4 $
$x^4-6 x^3+2 x-7+7 x^3-x+5 x^2+2-x^4 $
✓
Answer
$x^4-6 x^3+2 x-7+7 x^3-x+5 x^2+2-x^4 $
$ =x^4-x^4-6 x^3+7 x^3+5 x^2+2 x-x-7+2 $
$ =x^3+5 x^2+x-5 $
$ =x^4-x^4-6 x^3+7 x^3+5 x^2+2 x-x-7+2 $
$ =x^3+5 x^2+x-5 $
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