$14x^2-31x-10$
$\left(10-5a\right)^2$
$2x^2-3x+5-2x^2-3$
$\int\frac{z^2-2z+3}{z^3}dx$
$x^2+6x=3$
$\int\frac{2t^2}{\sqrt{1-t^6}}dx$
$-3\left(6x-7\right)-9$
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