$10x-90$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{x-2}-\sqrt{4-x}}\right)$
$2x^2=x$
$x+y=70$
$4x+1=6x-7$
$x^2y^3z\sqrt[7]{xy^4z^2}$
$\left(sinx+cosx\right)^2-2sinxcosx=1$
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