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-d-7=d+19
We move all terms to the left:
-d-7-(d+19)=0
We add all the numbers together, and all the variables
-1d-(d+19)-7=0
We get rid of parentheses
-1d-d-19-7=0
We add all the numbers together, and all the variables
-2d-26=0
We move all terms containing d to the left, all other terms to the right
-2d=26
d=26/-2
d=-13
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