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d+3(-d)=2
We move all terms to the left:
d+3(-d)-(2)=0
We add all the numbers together, and all the variables
d+3(-1d)-2=0
We multiply parentheses
d-3d-2=0
We add all the numbers together, and all the variables
-2d-2=0
We move all terms containing d to the left, all other terms to the right
-2d=2
d=2/-2
d=-1
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