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7+3b=5b-5
We move all terms to the left:
7+3b-(5b-5)=0
We get rid of parentheses
3b-5b+5+7=0
We add all the numbers together, and all the variables
-2b+12=0
We move all terms containing b to the left, all other terms to the right
-2b=-12
b=-12/-2
b=+6
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