$-15-28+2-80+50+-15+5$
$x^{2\:}+4x<-x\left(x-7\right)-22$
$\lim_{x\to2}\left(\frac{x^3-3x^2+4}{x^4-7x^3+18x^2-20x+8}\right)$
$x\:cos\:y\:=1$
$3x+2x+5x=30$
$\lim_{x\to-2}\left(-3x^2-2x+8\right)$
$\left(8v+12\right)^2$
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