30=10+b

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Solution for 30=10+b equation: 



30=10+b

We move all terms to the left:

30-(10+b)=0

We add all the numbers together, and all the variables

-(b+10)+30=0

We get rid of parentheses

-b-10+30=0

We add all the numbers together, and all the variables

-1b+20=0

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

-b=-20

b=-20/-1

b=+20

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