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-7b-1=-5b+-15
We move all terms to the left:
-7b-1-(-5b+-15)=0
We add all the numbers together, and all the variables
-7b-(-5b-15)-1=0
We get rid of parentheses
-7b+5b+15-1=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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