$\left(9-2i\right)-\left(2-5i\right)$
$\left(3a^2-5a+4\right)\left(12y\right)$
$10\cdot2+17$
$7u+3u$
$-5-8-6+12-13+14-22$
$2x^2+y^2=4x$
$\frac{d}{dx}xy^2-x^2y+3y+\pi=0$
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