$\left(10^2\right)^9$
$-35+-3+-38+-76$
$81x^2-64$
$12b-12b+3b-3b+b=18$
$-4x^2-16<0$
$\lim_{x\to4}\left(\frac{2x+1}{x-1}\right)$
$-4\left(5x-3\right)^2$
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