$-4875+2679$
$3\left(1\right)^3\left(-1\right)-6\left(1\right)^2\left(-1\right)^2+5-9\left(-1\right)^3\left(1\right)$
$\left(-xy^3-5x^3y^2\right)\left(3xy^3-3x^3y^2\right)$
$-\left(-3\right)+\left[\left(5\right)-\left(3+8-9\right)\right]$
$4-\left(-5\right)\:+0$
$3+7x<7\left(2-x\right)$
$f\left(x\right)\:=\:2.\left(3x\:-\:6\right)\:^2\:-\:18$
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