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a3=(-1)^3/3^2
We move all terms to the left:
a3-((-1)^3/3^2)=0
We add all the numbers together, and all the variables
a^3-((-1)^3/3^2)=0
We multiply all the terms by the denominator
a^3*3^2)-((-1)^3=0
We do not support eapression: a^3
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