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2d+7=4d-1
We move all terms to the left:
2d+7-(4d-1)=0
We get rid of parentheses
2d-4d+1+7=0
We add all the numbers together, and all the variables
-2d+8=0
We move all terms containing d to the left, all other terms to the right
-2d=-8
d=-8/-2
d=+4
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