$f\left(x\right)=x\left(x-2\right)\:$
$\lim_{x\to0}\left(5x\right)^{3x}$
$4\sin\left(x\right)+3=-2\sin\left(x\right)$
$\frac{9t^2\:+\:8}{t}\:=\:9t\:+\:8$
$-7z+3z+4z-8z$
$-18m^2+27m\cdot n$
$5abc^2+2abc^2+\frac{15}{3}abc^2$
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