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6b-81=7b-98
We move all terms to the left:
6b-81-(7b-98)=0
We get rid of parentheses
6b-7b+98-81=0
We add all the numbers together, and all the variables
-1b+17=0
We move all terms containing b to the left, all other terms to the right
-b=-17
b=-17/-1
b=+17
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