$\left(5+7f\right)^2$
$\int_{-\infty}^0\left(\frac{-2x}{\left(x^2+1\right)^2}\right)dx$
$2x^2+26x=23$
$5x-2=x+2$
$\int\left(3x-7\right)\cdot e^{-5x}dx$
$4m^2n+12m^2x-5bn-15bx$
$2+\left(-4-\:3\right)-\left(-4+\:2\right)$
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