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11d+5=7d+21
We move all terms to the left:
11d+5-(7d+21)=0
We get rid of parentheses
11d-7d-21+5=0
We add all the numbers together, and all the variables
4d-16=0
We move all terms containing d to the left, all other terms to the right
4d=16
d=16/4
d=4
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