61=21+2b

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Solution for 61=21+2b equation: 



61=21+2b

We move all terms to the left:

61-(21+2b)=0

We add all the numbers together, and all the variables

-(2b+21)+61=0

We get rid of parentheses

-2b-21+61=0

We add all the numbers together, and all the variables

-2b+40=0

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

-2b=-40

b=-40/-2

b=+20

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