b-15=3b-45

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Solution for b-15=3b-45 equation: 



b-15=3b-45

We move all terms to the left:

b-15-(3b-45)=0

We get rid of parentheses

b-3b+45-15=0

We add all the numbers together, and all the variables

-2b+30=0

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

-2b=-30

b=-30/-2

b=+15

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