$\frac{3}{7}z^2\cdot\:\frac{14}{21}x^2y$
$3\left(x+4\right)^{2}+6\left(x+4\right)$
$9a+10b-6c=-46$
$\int\frac{x+1}{x^2+7x-9}dx$
$\left(2a^2b^3c^2\right)^3$
$\frac{3}{4}\left(5-8u\right)$
$2\cos^2\left(x\right)+\sin^2\left(x\right)=2$
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