$\lim_{x\to0}\left(-7\right)$
$90-10t^2$
$\frac{2-x}{5}+\frac{x-3}{2}>1$
$80+100+120.5+180.2+200.3$
$-3+6-10y-x-12+2y$
$\frac{\left(\left(x^2+2\right)^3+\left(x+3\right)^2\right)}{\left(x^3-2\right)^4}$
$\frac{18x+81}{x-9}$
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