$10\left(x\:+\:2\right)\:=\:9x\:+\:20\:+\:x$
$x^2-8x=4$
$a\left(x-v\right)^2+u$
$\sec^2x\left(\sin x+\cos x\right)$
$2a+2$
$\frac{2^8}{2^5}$
$4x^2-9y^2=36$
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