$a^2y+7a^2y$
$2\frac{dy}{dx}=3^{x+y}$
$10=\frac{b}{15}-2$
$\lim_{x\to1}\left(\frac{\left(x-1\right)\left(x+1\right)}{x-1}\right)$
$\left(14a^3+15b^2\right)\left(14a^3-15b^2\right)$
$\int_1^{\infty}\left(\frac{x}{4+x^2}\right)dx$
$4z+1-z^2$
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