$40+-7+33$
$3x\:x\:7y$
$\int_0^1\left(3x-2\right).e^{-x}dx$
$\int te^{-7t^2}dt$
$\left(x\:+\:3y\right)\:dx\:+\:\left(y\:-\:x\right)\:dy\:=\:0$
$-2v+7v=-50$
$4+5y-2\left(5+2y\right)=6$
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