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2d+7=5d-2
We move all terms to the left:
2d+7-(5d-2)=0
We get rid of parentheses
2d-5d+2+7=0
We add all the numbers together, and all the variables
-3d+9=0
We move all terms containing d to the left, all other terms to the right
-3d=-9
d=-9/-3
d=+3
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