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42=7b-35
We move all terms to the left:
42-(7b-35)=0
We get rid of parentheses
-7b+35+42=0
We add all the numbers together, and all the variables
-7b+77=0
We move all terms containing b to the left, all other terms to the right
-7b=-77
b=-77/-7
b=+11
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