$13-5x+\left(7x\right)$
$\left(5x+1\right)\cdot\left(5x-1\right)+\left(5x+1\right)^2$
$siny=x$
$\frac{-3x^4+7x^2-x+5}{x\:+1}$
$\frac{540}{\left(-45\right)}+\left(-87\right)-16\cdot\left(-987\right)-456$
$\frac{28r^4}{-7r^{15}}$
$\frac{x+2}{x+1}\le3$
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