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4=d+12-3d=5d
We move all terms to the left:
4-(d+12-3d)=0
We add all the numbers together, and all the variables
-(-2d+12)+4=0
We get rid of parentheses
2d-12+4=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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