$\int_0^{15}\left(100\left(q+20\right)e^{-\left(0.2q+2\right)}-23.58\right)dq$
$4x^2-14\cdot2x+49$
$\frac{x}{1+x}+\frac{1-x}{x}$
$\left(y-7\right)\left(y+8\right)$
$\frac{8x}{3}\left(1+x\right)+3$
$45\cdot31$
$5ab+7b-12ab-5b$
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