$-\frac{3x^4}{-x^2}$
$-2\tan\left(x\right)^2-\tan\left(x\right)+1=0$
$\frac{2x^2-16x}{2x^2+8}$
$\int\frac{5x-10}{\left(x+3\right)\left(x^2+4x+5\right)}dx$
$15\cdot0\cdot2$
$\sqrt{5x^2}$
$\ln\left(4x+13\right)=\ln\left(3x+7\right)$
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