$\frac{x+1}{x^2+x-2}$
$y\left(\frac{x^2+4}{2}\right)$
$\left(-7\right)\left(-4\right)\left(2\right)$
$x=\frac{-6-x}{x}$
$x^8\cdot x$
$\left(13x-4\right)-\left(20x-15\right)$
$f\left(x\right)=\left(6x-2\right)\left(5x+7\right)^2$
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