$\left(-8x^3y^8z^{-2}\right)\cdot\left(9x^2y^3z\right)$
$-5\cdot3+8-\left(4-1\cdot8\right)$
$6x^2-7y^2=93$
$14x^2-21xy$
$7p-11+p-15$
$\left(5x-2\right).\left(-x^3\right)$
$\:\:-\:gh\:-\:\left(3gh\right)$
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