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7+5b=15b+9
We move all terms to the left:
7+5b-(15b+9)=0
We get rid of parentheses
5b-15b-9+7=0
We add all the numbers together, and all the variables
-10b-2=0
We move all terms containing b to the left, all other terms to the right
-10b=2
b=2/-10
b=-1/5
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