55=30+b

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Solution for 55=30+b equation: 



55=30+b

We move all terms to the left:

55-(30+b)=0

We add all the numbers together, and all the variables

-(b+30)+55=0

We get rid of parentheses

-b-30+55=0

We add all the numbers together, and all the variables

-1b+25=0

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

-b=-25

b=-25/-1

b=+25

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