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3d+4=-11-d
We move all terms to the left:
3d+4-(-11-d)=0
We add all the numbers together, and all the variables
3d-(-1d-11)+4=0
We get rid of parentheses
3d+1d+11+4=0
We add all the numbers together, and all the variables
4d+15=0
We move all terms containing d to the left, all other terms to the right
4d=-15
d=-15/4
d=-3+3/4
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