$30x+20y+30z=340$
$-4x^2+32x+36$
$\left(7-6+2\right)^2\cdot5$
$\sqrt{125b^5}$
$-30\::\:-5\::\:1$
$r^2-16r$
$27y^3+54y^2+12y+36y$
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