$\frac{x^3-2x+x+2}{x-2}$
$7x^3y^4-21x^4y^2+49x^2y^2$
$3,58-06$
$2x^4-7x+3\left(x^3-x^2-1\right)$
$7r=-63$
$-\sqrt{144}$
$\left[\right]\left(+6\right)-\left(-8\right)-\left[\right]-\left(-8\right)\left[\right]$
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