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9b+7=15b+1
We move all terms to the left:
9b+7-(15b+1)=0
We get rid of parentheses
9b-15b-1+7=0
We add all the numbers together, and all the variables
-6b+6=0
We move all terms containing b to the left, all other terms to the right
-6b=-6
b=-6/-6
b=1
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