$12a-19\left(-b\right)+3b+6\left(2a\right)$
$\left(4z^3\cdot2z\cdot z^3\right)^2$
$64-49x^2$
$\left(x+6\right)^7$
$25abc-33abc$
$\sec\left(t\right)=\cos\left(t\right)+\left(\sin\left(t\right)\right)\left(\tan\left(t\right)\right)$
$\frac{dy}{dx}-\frac{y}{x}=2x$
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