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1.5=2d+d
We move all terms to the left:
1.5-(2d+d)=0
We add all the numbers together, and all the variables
-(+3d)+1.5=0
We get rid of parentheses
-3d+1.5=0
We move all terms containing d to the left, all other terms to the right
-3d=-1.5
d=-1.5/-3
d=1/2
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