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-3+2d+2d=-6+7d
We move all terms to the left:
-3+2d+2d-(-6+7d)=0
We add all the numbers together, and all the variables
2d+2d-(7d-6)-3=0
We add all the numbers together, and all the variables
4d-(7d-6)-3=0
We get rid of parentheses
4d-7d+6-3=0
We add all the numbers together, and all the variables
-3d+3=0
We move all terms containing d to the left, all other terms to the right
-3d=-3
d=-3/-3
d=1
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