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16=4+3d
We move all terms to the left:
16-(4+3d)=0
We add all the numbers together, and all the variables
-(3d+4)+16=0
We get rid of parentheses
-3d-4+16=0
We add all the numbers together, and all the variables
-3d+12=0
We move all terms containing d to the left, all other terms to the right
-3d=-12
d=-12/-3
d=+4
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