$-\cos\left(\pi-x\right)-\sin\left(x-\frac{\pi}{2}\right)=1$
$\frac{dy}{dx}+7xy=4x$
$\left(4a^3\right)\left(5b^2\right)^2$
$7z\cdot5z^2$
$6-9z$
$2n+3-5n+6$
$x+y-x+y-y+x-x-x+x-y+y+y+y-x-y+y+y+x$
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