42-4b=12-b

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Solution for 42-4b=12-b equation: 



42-4b=12-b

We move all terms to the left:

42-4b-(12-b)=0

We add all the numbers together, and all the variables

-4b-(-1b+12)+42=0

We get rid of parentheses

-4b+1b-12+42=0

We add all the numbers together, and all the variables

-3b+30=0

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

-3b=-30

b=-30/-3

b=+10

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