$\frac{x}{2}+18=43$
$-1^2-4$
$1-6.251$
$\left(15-4\right)+3-\left(12-5\cdot2\right)+\left(5+16+4\right)-5+\left(10-23\right)$
$3n^2-3n-36$
$\frac{9x^2+6x+1}{3x+1}$
$\sqrt[3]{4a^3}-\sqrt{9a^2}$
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