$-84+-8\:\:\:\:4+1$
$a^4b^4-c^2$
$+9-\left(+7-12\right)+\left(+4-6\right)$
$-3<n$
$\log_{2x+1}\left(\frac{\left(2x+4\right)}{2}\right)=2$
$f\left(x\right)=\frac{6x^2+2x}{x-1}$
$\frac{3}{7}x^2+\frac{2}{7}x^2-\frac{1}{7}x^2$
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