$81+18x=x^2$
$b^2-\:12b\:+\:36$
$-12+59-\left[-120-\left(21\right)\cdot7\right]$
$\sqrt[3]{1^2}$
$\left(7-2\right)-\left(-6+4-3\right)$
$2\left(-1+-5\right)$
$\left(16\right)^3$
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