$-7x>-21$
$\int\frac{38}{e^{-x}+1}dx$
$y-3\le6$
$2\cdot\log_{10}\left(10^{\left(1+\frac{x}{2}\right)}\right)=\frac{4x}{3}$
$\tan\left(x\right)=\sin\left(x\right)\cdot\cos\left(x\right)$
$b^2-x^2$
$\frac{x^{1\:}}{x+1}$
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