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-15-13b-20=19-10b
We move all terms to the left:
-15-13b-20-(19-10b)=0
We add all the numbers together, and all the variables
-13b-(-10b+19)-15-20=0
We add all the numbers together, and all the variables
-13b-(-10b+19)-35=0
We get rid of parentheses
-13b+10b-19-35=0
We add all the numbers together, and all the variables
-3b-54=0
We move all terms containing b to the left, all other terms to the right
-3b=54
b=54/-3
b=-18
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