$\int\left(x^3+7x-2\right)e^xdx$
$\left(-20\right)-\left(10-15\right)^2+\left|\left(-5\right)+\left(8-13\right)^2\right|$
$6x^2\:+\:4x\:-3y\:+31=0$
$4x^2-12x+11$
$\frac{3x+21}{x^2-49}$
$4a^3-2a^2$
$-2\left(a+12\right)-3b-4a+4-12b$
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