$\left\{-\left[\left(20+4\right).5-8\right].\left(11-18\right)\right\}-\left\{5+\left[3-132:-2\right].7\right\}$
$\left(-7\right)x\left(4\right)x\left(-2\right)$
$\left(4^{12}\right)\left(4^6\right)$
$2x^2-5x+7$
$16m^2-32mn+16n^2$
$-2\left(6-\left(-3\right)+2^3\right)$
$2x^2+11x+6$
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