$\left(\frac{1}{2}a+\frac{2}{5}f-\frac{3}{4}g\right)^2$
$-x^2+6x^9$
$-4\:x\:-9$
$\frac{\left(\sqrt{18}x-78\right)}{8}^2$
$13x-13=169$
$2^3+7^3$
$\left(x^2+y^2+z^2=9\right)$
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