84=b+30

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Solution for 84=b+30 equation: 



84=b+30

We move all terms to the left:

84-(b+30)=0

We get rid of parentheses

-b-30+84=0

We add all the numbers together, and all the variables

-1b+54=0

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

-b=-54

b=-54/-1

b=+54

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