$x\cdot2\left(2x^3-3x^2-5x+7\right)$
$\left(5+6b\right)\left(5+6b\right)$
$\left(7x-2\right)\left(-7x-1\right)$
$\frac{1+\sin\left(x\right)}{\cos^2\left(x\right)}$
$-17+x=-19$
$\frac{5}{2x-3}-\frac{2}{2x+1}+\frac{4x}{14x^{2\:}}$
$\frac{dz}{dt}=6te^{7z}$
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