$\left(2b^2-4b\right)^2$
$-2x+2x\:-\:1$
$4+-5+-14$
$8mn-6mn$
$\int\frac{\left(6-lnx\right)^2}{x}dx$
$-71a^2b-84ab^2-50ab+84a^2b^2-45ab+18ab$
$\left(-2\right)\left|4\right|$
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