$\left(3x+2\sqrt{3}\right)\left(8x-3\sqrt{3}\right)$
$\frac{3}{4}-\frac{x-7}{x+15}=0$
$x^3+x:x-1$
$2x+x^2-4x^2+6x-x\:3$
$27^2$
$\int\frac{x^3-2x+7}{x^2+x-2}dx$
$7a+9b+6a-4b-9a+18c$
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