$-1-1-3+4cy-cy$
$\left(6ab-2x\right)^2$
$\int\frac{2}{x^2\sqrt{64+x^2}}dx$
$\frac{dy}{dx}+\frac{y}{7}=0$
$\left(a^2+4a+4\right)\left(a+2\right)$
$2x+y-z=10$
$7.5\cdot9$
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