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5b=7-2b
We move all terms to the left:
5b-(7-2b)=0
We add all the numbers together, and all the variables
5b-(-2b+7)=0
We get rid of parentheses
5b+2b-7=0
We add all the numbers together, and all the variables
7b-7=0
We move all terms containing b to the left, all other terms to the right
7b=7
b=7/7
b=1
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