$15a+21a-13a+8a-12a+7a$
$\left(x+xy^2\:\right)dx+e^{\left(x^2\:\right)}\:ydy=0$
$144y^2-256$
$49u^2-28u+4$
$\frac{x^4-3x^2+3x-2}{x-2}$
$2.5-4+2-12:3$
$50+190$
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