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7b-15b=5b-3
We move all terms to the left:
7b-15b-(5b-3)=0
We add all the numbers together, and all the variables
-8b-(5b-3)=0
We get rid of parentheses
-8b-5b+3=0
We add all the numbers together, and all the variables
-13b+3=0
We move all terms containing b to the left, all other terms to the right
-13b=-3
b=-3/-13
b=3/13
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