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15-4b-7b=-1-6b-7b
We move all terms to the left:
15-4b-7b-(-1-6b-7b)=0
We add all the numbers together, and all the variables
-4b-7b-(-13b-1)+15=0
We add all the numbers together, and all the variables
-11b-(-13b-1)+15=0
We get rid of parentheses
-11b+13b+1+15=0
We add all the numbers together, and all the variables
2b+16=0
We move all terms containing b to the left, all other terms to the right
2b=-16
b=-16/2
b=-8
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