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19=-7-3d-4
We move all terms to the left:
19-(-7-3d-4)=0
We add all the numbers together, and all the variables
-(-3d-11)+19=0
We get rid of parentheses
3d+11+19=0
We add all the numbers together, and all the variables
3d+30=0
We move all terms containing d to the left, all other terms to the right
3d=-30
d=-30/3
d=-10
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