$-4d\left(7d^2-4d+3\right)$
$x^2-26x=-15$
$\frac{dy}{dx}=\frac{x\:sin^2\:y}{x\:+\:1}$
$\left(a-6\:\right)\left(a\:+9\right)$
$t+16=-5$
$\frac{64x^6-b^{12}}{2x+b}$
$3x+2y+2x-y$
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