$3ax-3x+4y-4ay$
$\frac{d}{dx}\frac{1}{x}e^x$
$\left(2+2i\right)\left(2+2i\right)+\left(5-2i\right)\left(5-2i\right)$
$2a+3b-a+5b$
$2x^212x+9$
$\frac{\left(x^3+3x-4\right)}{x-1}$
$xy+4y=x^3-x$
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