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-13=1-6b+4b
We move all terms to the left:
-13-(1-6b+4b)=0
We add all the numbers together, and all the variables
-(-2b+1)-13=0
We get rid of parentheses
2b-1-13=0
We add all the numbers together, and all the variables
2b-14=0
We move all terms containing b to the left, all other terms to the right
2b=14
b=14/2
b=7
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