$x-y+3z=1$
$4n+6+n-2$
$\left(a+2\right)\left(a-6\right)$
$3x+6x\:+9$
$\left(\tan\left(x\right)\right)\left(1-\sin^2x\right)=\frac{\sin\left(2x\right)}{2}$
$\int x^3\cdot e^{-2}$
$\frac{-5ab^2}{-2ab}$
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