$-\left(+2\right)+\left(-1\right)+\left(-4\right)-\left(-5\right)$
$2\cdot\left(6+2\right)-\left(-\left(-4\right)-\left(12-8\right)\right)$
$\left(18\right)\left(4\right)+18-\left(-2\right)\left(11\right)$
$\left(g+11\right)\left(g+11\right)$
$x^2-9x+8=0$
$2x-x+1$
$-3^2\cdot\left(-6\right)$
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