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(d2+6d+9)+(d3+6d+9)=(d2+6d+9)+(d3+6d+9
We move all terms to the left:
(d2+6d+9)+(d3+6d+9)-((d2+6d+9)+(d3+6d+9)=0
We add all the numbers together, and all the variables
(+d^2+6d+9)+(+d^3+6d+9)-((+d^2+6d+9)+(+d^3+6d+9)=0
We get rid of parentheses
d^2+d^3-((+d^2+6d+9)+(+d^3+6d+9)+6d+6d+9+9=0
We do not support edpression: d^3
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