$\frac{y^{-5}}{y^{-6}}$
$\frac{343-27^3}{7+3x}$
$1x^2+22x+484$
$-20-\left(-7\right)$
$y^2-23y+132$
$2x\:+\:4y\:+\:3z\:para\:x\:=3,\:y\:=-2,z=-1$
$\left(2y+2x\right)\left(2y-3x\right)$
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