$-2x-5=7$
$\left(2x^2+2x\right)-\left(x^2-6\right)$
$\frac{d^y}{dx^y}\left(2a^2\right)$
$\left(x-1\right)\left(x+21\right)$
$\int\frac{4e^{3x}}{e^{3x}+1}dx$
$25y^2-60y+144$
$\frac{2x^2-11x+12}{x^2+4x\:+4}=0$
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