$4^2-2^2$
$\log_x\left(512\right)=3$
$22.5x-45.7x$
$\int\:\csc^2\:\frac{3x}{2}\:dx$
$5x-y=20$
$25+12+10+36+40$
$y\:=\:3x^{-x}$
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