$-986+\left(-13\right)$
$\frac{2x^2+x-2}{x-1}$
$31-\left(+17\right)-\left(-12\right)-\left(+5\right)$
$2\left(-2\right)\left(4\right)$
$x\left(x+1\right)+2<x\left(x-3\right)$
$5a^2+2a+8+4a^2+5a-6$
$6\cdot\left(1-3\right)$
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