31-3b=19

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Solution for 31-3b=19 equation: 



31-3b=19

We move all terms to the left:

31-3b-(19)=0

We add all the numbers together, and all the variables

-3b+12=0

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

-3b=-12

b=-12/-3

b=+4

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