$3-x<-4$
$-39\:-\left(-114\right)$
$\lim_{x\to0}\left(\frac{x^2-x^4}{x^2}\right)$
$-\left(-1.8g-4u\right)-3$
$x^2-1x\:x+1$
$\int\frac{3x+4}{x\left(x+2\right)^2}dx$
$a^2-8\cdot a^2-9$
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