$-7\cdot9+4\cdot10$
$\frac{dv}{dt}=0.002\left(30-v\right)$
$1.5x\:+\:3y\:+\:5\:+7a\:-\:3x\:-\:2y\:+\:3\:$
$x^2\:-\:4x\:=\:1$
$\frac{7}{\sqrt{7}}$
$5ax+15x$
$\left(7x+2y^3\right)^3$
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