$-b\left(b+1\right)\cdot\left(a-b\right)$
$\left(-3q^2r^3\right)^5$
$8-\left(-4-2+3\right)+1$
$y^4-10y^2+21$
$\left(a\:-\:8\right)\:\left(a\:+\:8\right)$
$4-\left(8+\left(-11\right)\right)$
$2x+x-x-2y$
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