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

-(-1b+10)+30=0

We get rid of parentheses

1b-10+30=0

We add all the numbers together, and all the variables

b+20=0

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

b=-20

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