$3x^2+\left(x-2\right)\left(x+1\right)=\left(2x-2\right)\left(2x+1\right)$
$3x^2+\left(1-x\right)\left(2+x\right)$
$\int\:\frac{1}{\left(x-1\right)\sqrt{x^2-3x+2}}dx$
$\frac{6x^7y^6}{10x^5y^9}$
$\frac{3x+2}{6}-x=-\frac{2x+1}{3}$
$\left(-15+5\right)-\left(-17+5\right)$
$x-5\cdot x+5$
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