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-5d-(-11d)-3d+3d-(-12d)=-18
We move all terms to the left:
-5d-(-11d)-3d+3d-(-12d)-(-18)=0
We add all the numbers together, and all the variables
-5d-(-11d)-(-12d)+18=0
We get rid of parentheses
-5d+11d+12d+18=0
We add all the numbers together, and all the variables
18d+18=0
We move all terms containing d to the left, all other terms to the right
18d=-18
d=-18/18
d=-1
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