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