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7=d/3+4
We move all terms to the left:
7-(d/3+4)=0
We get rid of parentheses
-d/3-4+7=0
We multiply all the terms by the denominator
-d-4*3+7*3=0
We add all the numbers together, and all the variables
-1d+9=0
We move all terms containing d to the left, all other terms to the right
-d=-9
d=-9/-1
d=+9
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