$30\:x\:+\:42\:y\:=\:66$
$\int4g^3dg$
$\left(3xy+2a\right)^2$
$\frac{\left(2\:x\:y\:-\:21\:x^2\:y^2\:+\:10\:x\:y^3\right)}{-2\:x\:+\:y}$
$\frac{dw}{dx}=\frac{7}{2}-\frac{39}{50}w$
$\left(\frac{9}{5}+\frac{7v}{9}\right)^2$
$\left(15a^2b^2-16ab^3\right)^2$
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