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42=2b-8
We move all terms to the left:
42-(2b-8)=0
We get rid of parentheses
-2b+8+42=0
We add all the numbers together, and all the variables
-2b+50=0
We move all terms containing b to the left, all other terms to the right
-2b=-50
b=-50/-2
b=+25
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