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-11+18b=7b+13b+15
We move all terms to the left:
-11+18b-(7b+13b+15)=0
We add all the numbers together, and all the variables
18b-(20b+15)-11=0
We get rid of parentheses
18b-20b-15-11=0
We add all the numbers together, and all the variables
-2b-26=0
We move all terms containing b to the left, all other terms to the right
-2b=26
b=26/-2
b=-13
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