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a(a+1)(a+2)=210
We move all terms to the left:
a(a+1)(a+2)-(210)=0
We multiply parentheses ..
a(+a^2+2a+a+2)-210=0
We multiply parentheses
a^3+2a^2+a^2+2a-210=0
We do not support eapression: a^3
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