b+51=3b+9

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Solution for b+51=3b+9 equation: 



b+51=3b+9

We move all terms to the left:

b+51-(3b+9)=0

We get rid of parentheses

b-3b-9+51=0

We add all the numbers together, and all the variables

-2b+42=0

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

-2b=-42

b=-42/-2

b=+21

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