$1\:-2\:-26\:+27\:-90$
$74-70cosx$
$\:\left(3x^3+16x\right)^3$
$\left(5x^2+3xy-2y\right)\left(\frac{1}{3}x\frac{1}{2}y\right)$
$\left(4xy+3\right)\left(4xy-3z\right)$
$\frac{x+2}{3}=\frac{x+4}{5}$
$\frac{x^3-729}{\sqrt{x}-3}$
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