$2^{2}-4x-5$
$\left(x+1\right)\left(x+3\right)+\left(x-2\right)^2$
$3+n=-18$
$\left(b^2-bc+bc^2+1\right)\:b\:$
$15x^2y^2-10x^2y^6+20x^5$
$\left(12\right)\left(2\right)\left(-1\right)\left(-3\right)$
$5x=40$
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