$xy+2x+3x^2=4$
$-2x^4+6x^2-4x$
$z2\:+\:15\:z\:+\:56$
$x-6\:+3x\:+4$
$m^2+3y=0$
$\frac{dy}{dx}=30+36x+15y+18xy$
$\sin\left(2x\right)=-\frac{1}{\sqrt{2}}$
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