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7=11-2d
We move all terms to the left:
7-(11-2d)=0
We add all the numbers together, and all the variables
-(-2d+11)+7=0
We get rid of parentheses
2d-11+7=0
We add all the numbers together, and all the variables
2d-4=0
We move all terms containing d to the left, all other terms to the right
2d=4
d=4/2
d=2
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