$\left(x+4\right)\left(x^2-4x+16\right)$
$8\:x\:\left(-6\right)x\left(-7\right)$
$15-\left(-61\right)$
$a-5+5$
$\log\left(x\right)+4\log\left(y\right)-3\log\left(z\right)$
$20a^3z^2-40a^2z^3$
$2x\:\ge\:15\:$
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