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98=b/7+91
We move all terms to the left:
98-(b/7+91)=0
We get rid of parentheses
-b/7-91+98=0
We multiply all the terms by the denominator
-b-91*7+98*7=0
We add all the numbers together, and all the variables
-1b+49=0
We move all terms containing b to the left, all other terms to the right
-b=-49
b=-49/-1
b=+49
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