$3-4\left(2b-9\right)$
$x^2+3x-4=6$
$\left(-2xy^2+9xy^3\right)\left(2xy^2-9xy^3\right)$
$y'\:=\:2xy2$
$\log\left(x\right)+\log\left(3x+5\right)=2$
$x+y+2-2x-24-z$
$\sqrt[2]{m^7}$
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