$\frac{6}{a-8}=\frac{-a}{a-4}$
$15-\left(-15\right)$
$\frac{6nmx}{35}-\frac{2}{5}nm$
$4x^2+8x+2x$
$-2\sqrt{3}+\sqrt{12}$
$3\left(a+3\right)^2-4x+1$
$\sqrt[2]{-1}-\sqrt{64}$
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