$\frac{3}{x+2}-\frac{3}{x-2}=\frac{x-10}{x^2-4}$
$m^2+7-4m^2$
$\log\left(2x^2+4x\right)$
$\frac{0}{x+1}$
$25x^2-50x^2+11x^2+14x^2$
$\left(2a^3+3b^3\right)\left(2a^3-3b^3\right)$
$\int\left(2x-1\right)^2\cdot\ln\left(2x-1\right)^2dx$
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