Answer
t(6r+t)(r+t)
Work Step by Step
6$r^{2}$t+7r$t^{2}$+$t^{3}$=t(6$r^{2}$+7rt+$t^{2}$)=
t(6$r^{2}$+6rt+rt+$t^{2}$)=
t[6r(r+t)+t(r+t)]=t(6r+t)(r+t)
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