7b=3b-b+45

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Solution for 7b=3b-b+45 equation: 



7b=3b-b+45

We move all terms to the left:

7b-(3b-b+45)=0

We add all the numbers together, and all the variables

7b-(2b+45)=0

We get rid of parentheses

7b-2b-45=0

We add all the numbers together, and all the variables

5b-45=0

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

5b=45

b=45/5

b=9

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