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15=5b-5
We move all terms to the left:
15-(5b-5)=0
We get rid of parentheses
-5b+5+15=0
We add all the numbers together, and all the variables
-5b+20=0
We move all terms containing b to the left, all other terms to the right
-5b=-20
b=-20/-5
b=+4
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