$\left(9g+5\right)+\left(-2g-4\right)$
$4x^2-12x+9=10$
$\frac{3x^2+5x-13}{\left(3x+2\right)\left(x^2-4x+4\right)}$
$8y^2-50$
$\left(50-i\cdot1000\right)\left(50+i\cdot1000\right)$
$5\sqrt{6}.4\sqrt{8}$
$\frac{d}{dx}\left(\pi^2+2^x+x^2+x^{\frac{1}{x}}\right)$
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