$-a+4a$
$-2+3+1-2+4+2-4-5$
$4-x=17$
$\frac{x-2}{x}<5$
$\int x\left(2x-4\right)dx$
$2y^2+5y+2$
$\left(9x^2-\:2y-4\right)^2$
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