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-79=-3b-49
We move all terms to the left:
-79-(-3b-49)=0
We get rid of parentheses
3b+49-79=0
We add all the numbers together, and all the variables
3b-30=0
We move all terms containing b to the left, all other terms to the right
3b=30
b=30/3
b=10
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