$3x^5+18x^3+27x$
$25x^2\:9y^2$
$4+42+49-6$
$\frac{a+b}{c}-\frac{b-m}{d}$
$\left(x+y+3\right)^2$
$\ln\sqrt{x-4}$
$\left(5\frac{1}{2}xy+2\frac{4}{3}m\right)^3$
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