$\left(-4\right)^2-5\left(-4\right)-36$
$\left(8m-4w\right)\left(8m+4w\right)$
$\frac{10x^2-29x-21}{2x+3}$
$2sinxcosx+\frac{\sqrt{2}}{2}=0$
$7\:=5+\frac{x}{4}$
$10\cdot0.75$
$s-21\le-18$
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