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2(b-4)+15=13
We move all terms to the left:
2(b-4)+15-(13)=0
We add all the numbers together, and all the variables
2(b-4)+2=0
We multiply parentheses
2b-8+2=0
We add all the numbers together, and all the variables
2b-6=0
We move all terms containing b to the left, all other terms to the right
2b=6
b=6/2
b=3
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