$93x^2y^4z-62x^2yz^3-124xy$
$20-4\left(x+3\right)$
$\frac{sen}{tan}+\frac{sec}{sen}$
$4x+37.7x-3159.8$
$x^2-18x+-5$
$\left(a-b+n\right)^2$
$a^2+5^2$
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