$y=\frac{2x+4}{1-x}$
$x\ln\left(x\right)\frac{dy}{dx}=\frac{1}{y^2}$
$4x^2+9x-100=0$
$-17+-4+2-8$
$3b\cdot5a+10$
$x^2-16x^2$
$5cotx+4=-1$
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