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4+d=2+2d
We move all terms to the left:
4+d-(2+2d)=0
We add all the numbers together, and all the variables
d-(2d+2)+4=0
We get rid of parentheses
d-2d-2+4=0
We add all the numbers together, and all the variables
-1d+2=0
We move all terms containing d to the left, all other terms to the right
-d=-2
d=-2/-1
d=+2
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