$5ab-3bc+4cd+2bc+2bc-3d+4bc-2ab+3d-3bc-6cd-ab$
$2356-46$
$-4b^2-19b=-4b+10$
$a\frac{a}{\sqrt{a^2-x^2}}$
$\frac{-35}{7}+-12$
$\left(x+2\right)\left(xt2\right)$
$y'\:+\:2xy\:=\:2e^{-x^2}$
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