$28xy^2-84xy+63x$
$50-x=\frac{87-x}{2}$
$\left(-8\right)\cdot\left(+2\right)-\left(-13\right)\cdot\left(+5\right)$
$-5+4+5-1+2$
$\left(xy-xy^3\:\right)^2$
$\int_1^2\left(\frac{x}{x^2+4x+20}\right)dx$
$\frac { 0 } { \frac { 0 } { 2 } }$
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