$\left(2a-9\right)\left(2x\:+\:6\right)$
$\frac{2x-4}{x-2}$
$\frac{\left(2x\right)\left(3x\right)^2}{x^2}$
$\lim_{x\to3}\left(3^x-x^3\right)$
$-2x-9y=-10$
$10x+4-3+8x+2$
$x^{3\:}+y^3=100$
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