$4x+16=36$
$\frac{sec\left(x\right)^2}{sec\left(2x\right)}$
$\int\frac{e^u}{\left(2-e^u\right)^2}du$
$t\frac{dx}{dt}-x=\sin\left(t\right)$
$\:x=7;\:y=10a=-4$
$18+x=27$
$\int a^tdt$
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