$-5b+7b-12b$
$2y^2+5y+2=0$
$\left(5x^2y^{10}\right)\left(-4x^4y^2\right)$
$-4x^2+16x+20+9y^2=0$
$a\:+\:7a$
$\cos\left(b+180\right)$
$\frac{-2g^2-17g+14}{g+2}$
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