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