$x\:5\:-\:3\:x\:4\:-\:4\:x\:$
$4-cos^2\left(a\right)$
$-\left(x^2y^3\right)^6$
$\left(\frac{2x}{5}+\frac{3}{7}\right)\left(\frac{2x}{5}-\frac{7}{5}\right)$
$21ab+10ab^2-101a^2$
$10+5^3-1$
$\left(88-b\right)^2$
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