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9=-13b+5b
We move all terms to the left:
9-(-13b+5b)=0
We add all the numbers together, and all the variables
-(-8b)+9=0
We get rid of parentheses
8b+9=0
We move all terms containing b to the left, all other terms to the right
8b=-9
b=-9/8
b=-1+1/8
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