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3=15-b
We move all terms to the left:
3-(15-b)=0
We add all the numbers together, and all the variables
-(-1b+15)+3=0
We get rid of parentheses
1b-15+3=0
We add all the numbers together, and all the variables
b-12=0
We move all terms containing b to the left, all other terms to the right
b=12
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