13-2b=9

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Solution for 13-2b=9 equation: 



13-2b=9

We move all terms to the left:

13-2b-(9)=0

We add all the numbers together, and all the variables

-2b+4=0

We move all terms containing b to the left, all other terms to the right

-2b=-4

b=-4/-2

b=+2

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