-9=7-8b

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Solution for -9=7-8b equation:



-9=7-8b
We move all terms to the left:
-9-(7-8b)=0
We add all the numbers together, and all the variables
-(-8b+7)-9=0
We get rid of parentheses
8b-7-9=0
We add all the numbers together, and all the variables
8b-16=0
We move all terms containing b to the left, all other terms to the right
8b=16
b=16/8
b=2

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