$9\left(-3+15\right)$
$\int\left(4-2\sqrt{y}\right)^2dy$
$x'=1+\left(\frac{x}{t}\right)$
$\left(2m+9\right)\left(2m-4\right)$
$5y-2y-5+2+9$
$-5a+2x-4x$
$x^4+3x^2-28$
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