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3b-72=b+58
We move all terms to the left:
3b-72-(b+58)=0
We get rid of parentheses
3b-b-58-72=0
We add all the numbers together, and all the variables
2b-130=0
We move all terms containing b to the left, all other terms to the right
2b=130
b=130/2
b=65
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