$v-4v$
$\int\frac{x^2}{-\left(2x+1\right)\left(2x-3\right)^3}dx$
$3x^3-6x^4$
$\ln\left(3+x\right)\left(3+y\right)$
$5\cdot6+8$
$\lim_{x\to0}\:\frac{\sqrt{1+2x}-\sqrt{1-10x}}{x}$
$2x^2-2x-7$
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