$\left(-7-\left(-10\right)\right)\cdot8$
$\left(a^{2n}b^m-2x^3y^a\right)\:\left(a^{2n}b^m+2x^3y^a\right)$
$4b+\left(-8\right)b$
$6-\left(12-5+11\right)-\left[13-\left(2+7-1\right)+8\right]$
$2xy^2=0$
$\frac{x^3-2x^2-11x+12}{x-1}$
$4+-1+4+-2$
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