$3x^2+4xy-2y^3;\:x=-3;\:y=2$
$\left(2x-y+3z-4\right)^2$
$4+3\left(-5+7\right)$
$sec\left(-x\right)sin\:x\:=\:tan\:x$
$4x+10=x-5$
$3x\:-\:14\:+\:4x$
$b^2-3b-28$
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