$5m-2m+3y$
$\frac{d}{dx}x^5y^5-y=x$
$15j^2k^2\:+\:21j^2k^2$
$f\left(\frac{x+1}{x}\right)=xg\left(x\right)=\frac{1}{x-1}$
$a^2\left(1-2b\cos\left(x\right)-b^2\sin^2\left(x\right)\right)$
$2x^2+3x-x^2-7x$
$2x^2+5x^2-1$
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