$-3\:+x=-9$
$2x^2+7-15$
$\lim_{x\to\infty}\left(4x-5\right)e^{-x}$
$2x+6<3$
$\int x^2\sqrt{7-x^3}dx$
$t\frac{dy}{dt}+7y=6t$
$\left(2x^2+10x+12\right)-\left(x+3\right)$
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