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d.2d+4=10+2.5d^2d+4=10+2.5d
We move all terms to the left:
d.2d+4-(10+2.5d^2d+4)=0
We get rid of parentheses
-2.5d^2d+d.2d-10-4+4=0
We add all the numbers together, and all the variables
-2.5d^2d+d.2d-10=0
We move all terms containing d to the left, all other terms to the right
-2.5d^2d+d.2d=10
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