$f\left(x\right)=-2x\left(x-2\right)\left(x-5\right)$
$1-\frac{1}{2\infty}$
$36b^2-21b+1$
$3-x=\sqrt{x-1}$
$-6c+8=116$
$\left(2x^{2\:}-3x-2\right)\left(2x+1\right)$
$4a+5\left(3\right)$
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