$-27-\left(-30\right)$
$3\left(4-b\right)=27$
$\frac { m ^ { - 3 } } { 3 m ^ { 6 } }$
$\left(40\:x^2y^2z-6xy^3\right)$
$2x+18=6y$
$\left(x^3+4x^2+4x+1\right)+\left(x+1\right)$
$\sqrt{20u^{15}}$
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