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9b+7=72+b
We move all terms to the left:
9b+7-(72+b)=0
We add all the numbers together, and all the variables
9b-(b+72)+7=0
We get rid of parentheses
9b-b-72+7=0
We add all the numbers together, and all the variables
8b-65=0
We move all terms containing b to the left, all other terms to the right
8b=65
b=65/8
b=8+1/8
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