$\frac{120}{4}$
$\left(9x^4+7y^6\right)^2$
$\left(\frac{1}{3}\right)x^2+2x^2-\left(\frac{1}{2}\right)x^2+6x^2$
$\frac{sin\theta\:}{1-cos\theta\:}+\frac{sin\theta\:}{1+cos\theta\:}$
$5\sqrt{x}^3$
$x+2=2x+7$
$2,5\:+\:18,75$
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