$2x^2n-2x^2+x^2-1$
$4\sqrt{-400}$
$-ab^2;8\:y\:b=-4$
$7\left(-8v-8\right)+5$
$\frac{x}{3}+10=15$
$4x^2-9y^2$
$\frac{\left(\sec\left(x\right)-5\right)}{1-5\cos\left(x\right)}$
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