$\frac{2}{x}-3<-1$
$-29\cdot4$
$-\left|-3+6-\left(-8\right)\right|$
$3x^2y+4xy^2$
$\left(4\sqrt{x}+3\right)\left(x^2\right)$
$5sen^2x-1=0$
$\frac{1}{25-sin^2x}$
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