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-7=d/4
We move all terms to the left:
-7-(d/4)=0
We add all the numbers together, and all the variables
-(+d/4)-7=0
We get rid of parentheses
-d/4-7=0
We multiply all the terms by the denominator
-d-7*4=0
We add all the numbers together, and all the variables
-1d-28=0
We move all terms containing d to the left, all other terms to the right
-d=28
d=28/-1
d=-28
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