$-405a-80a+7a-88g+123g$
$a+\frac{c}{d-n}$
$\left(ax\right)\left(by\right)^2$
$\sec^2x\left(1-sin^2x\right)$
$10x^2-5x^5+15x^3$
$\lim_{x\to3}x^2-1$
$x^2-20x=1$
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