$4x+2x-5x+7x+x$
$-x^2-10x-8=0$
$15+\left(-9+12\right)-\left(-10-9-15\right)-\left(-21\right)$
$f\left(x\right)=\left(x+1\right)^2-2x$
$3x+6=2x-5$
$\left(-6\right)\left(3\right)\left(-1\right)$
$\lim_{x\to2}\left(2-\frac{x^2-4}{2x-x^2}\right)$
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