$-2\left(x+2\right)-5x$
$5^3\cdot\left(-5\right)^2$
$x\left(2x-9\right)=0$
$u2\:+\:24u\:=\:-47$
$csc\left(x+5\pi\right)=-cscx$
$m^2n^2-mn^3-mn^2v$
$3xy^2-5xy^2+xy^2+12xy^2$
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