$3x^2+5+x-2x^2-8+x$
$-6c+12+15-5c-4c+7$
$\frac{\left(2-y^2\right)}{\left(y^2-2y\right)}$
$xa+xb-xc$
$\int10x+100\cdot e^{-0.1x-1}dx$
$\left(x+3\right)^2\:y\:\left(x-3\right)^2$
$y\left(4x^2\left(x+1\right)+1\right)dx+4\left(x+1\right)dy$
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