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16=2d+3d-4
We move all terms to the left:
16-(2d+3d-4)=0
We add all the numbers together, and all the variables
-(5d-4)+16=0
We get rid of parentheses
-5d+4+16=0
We add all the numbers together, and all the variables
-5d+20=0
We move all terms containing d to the left, all other terms to the right
-5d=-20
d=-20/-5
d=+4
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