$4x^4+6x^4-7x^4$
$x^2+2x-12-x^2-y^2-y^2-2y$
$\:\frac{2x^3+3x+22}{x+2}\:\:$
$\frac{3\cot\left(x\right)^2-2\cos\left(x\right)^2}{\csc\left(x\right)^4}$
$\frac{dy}{dx}\left(8+x\right)=4+x$
$\left(3x^2+2y^2\right)\left(9x^6-6x^3+4y^4\right)$
$30=11-x$
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