$\left(4xy-2x\right)^2$
$4x-6$
$\left(5m-3n\right)^2$
$\left(-1\right)+\left(+5\right)+\left(+2\right)-\left(-12\right)$
$\left(-3\right)-\left(-39\right)$
$-9y^2+2y^2$
$75.1\:+56.13$
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