$\left(-1+\frac{4x}{z}\right)^2$
$\left(a+b+c+d\right)^3-\left(b+c+d\right)^3$
$\:\:+1-\left(-8-10\right)+\left(+7-5\right)$
$2xy-y+3x;\:x=-3;\:y=2$
$\:\:\left(\:9m\:-\:8n\:\right)\:\left(\:6m\:+\:4n\:\right)$
$\left(5a^8\right)^2$
$\left(-3\right).\left(9\right).5$
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