$\left(7x^2+2b^2\right)\left(7x^2-2b^2\right)$
$3x-15+5x-23$
$x^2-2x-1=0$
$\frac{y}{3}-9=8$
$-5x\left(4-x\right)$
$\lim_{x\to0}\left(\frac{x}{\ln\left(x^2\right)}\right)$
$\int\frac{x}{\left(x+6\right)}dx$
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