$\left(a^2+2\right)\left(a^2+3\right)$
$\left(x+7\right)\left(x+3\right)-\left(x+5\right)^2+9$
$-\frac{1}{2}x+\frac{x+1}{7}+2=0$
$x^9-y^9$
$\lim_{x\to+\infty}\left(x+e^x\right)^{\frac{2}{x}}$
$\int\left(7x\arctan\left(x\right)\right)dx$
$-8x=11x$
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