$\left(+70-45\right)+82\left|3\cdot\left(+45-16\right)\right|$
$\lim_{x\to-8}\:ln\left(\left(x+8\right)^7\right)$
$-20ab+11ab$
$\left(1+\tan a\right)\left(1-\cot a\right)$
$3b^2+2c-5d=3$
$4x-3>1$
$5x-2\ge6$
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