$2\left(15-6\right)+5\left(10+2\right)-\left(4\right)$
$\frac{2x}{3}-2=0$
$- 15 z \leq 75$
$\frac{2x-x^2-x^3}{x^3-3x+2}$
$\frac{12x^5}{4x^7}$
$\frac{\left(x+2\right)^9}{\left(2x-8\right)^{12}}$
$4x^2=36$
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