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16d+15-16d=19-d
We move all terms to the left:
16d+15-16d-(19-d)=0
We add all the numbers together, and all the variables
16d-16d-(-1d+19)+15=0
We add all the numbers together, and all the variables
-(-1d+19)+15=0
We get rid of parentheses
1d-19+15=0
We add all the numbers together, and all the variables
d-4=0
We move all terms containing d to the left, all other terms to the right
d=4
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