$3a-15$
$2+6-9-1+4-7-2+8$
$\int_{-\infty}^3\left(x^2e^x\right)dx$
$\frac{x^2+13x+42}{x+7}$
$\frac{d^2y}{dx^2}=\:2x+sin\left(\:x\:\right)+e^x$
$\left(3x^2+y^2\right)^3$
$x^2=-a$
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