42-4b=30

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Solution for 42-4b=30 equation: 



42-4b=30

We move all terms to the left:

42-4b-(30)=0

We add all the numbers together, and all the variables

-4b+12=0

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

-4b=-12

b=-12/-4

b=+3

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