$2x+4y-6x-2y$
$\:3\left(a\right)\left(2\right)^2$
$\frac{9r^8}{3r^4}$
$\frac{\sqrt{2}}{\frac{1}{x}}$
$\frac{4}{4}-2$
$\left(\frac{y}{4}\right)^4$
$-4\left(r-1\right)$
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