$\left(a+7\right)^2-\left(a-7\right)^2$
$-3a^xb^nc\left(-69^3b^4c\right)$
$\lim_{x\to4}\left(\frac{2x^2-8x}{x^2-16}\right)$
$x^2+5x+4<0$
$log\left(x\right)+log\left(x+2\right)=3$
$6m+14$
$x+7=-128$
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