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15-3b=4b+1
We move all terms to the left:
15-3b-(4b+1)=0
We get rid of parentheses
-3b-4b-1+15=0
We add all the numbers together, and all the variables
-7b+14=0
We move all terms containing b to the left, all other terms to the right
-7b=-14
b=-14/-7
b=+2
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