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a2(a+3)+3(2a-1)=19a=
We move all terms to the left:
a2(a+3)+3(2a-1)-(19a)=0
We add all the numbers together, and all the variables
-19a+a2(a+3)+3(2a-1)=0
We multiply parentheses
a^3+3a^2-19a+6a-3=0
We do not support eapression: a^3
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