$\left(5^2\right)^{-3}=5^{-6}$
$\frac{-4}{x-9}+\frac{9}{x+9}=\frac{-72}{x^2-81}$
$\sec^2\left(x\right)\cdot\tan\left(y\right)dx+\sec^2\left(y\right)\cdot\tan\left(x\right)dy=0$
$t5-5t$
$\left(2a^x+\:b^x\right)^2$
$2+3b-a-2b$
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