$\left|\left(-18\right)+\left(+13\right)\right|+\left(+7\right)$
$7x+2x-2a+4a+5w-2w+3y$
$8\left(6+4\right)$
$\frac{8x^2+20x^3}{4x^2}$
$2-i+x=3+6i$
$\left(2x^2+3x-22-4x^2-5x+7\right)$
$\int\:\:3x^6\sqrt{2-x^7}dx$
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