3b=b-18

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Solution for 3b=b-18 equation: 



3b=b-18

We move all terms to the left:

3b-(b-18)=0

We get rid of parentheses

3b-b+18=0

We add all the numbers together, and all the variables

2b+18=0

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

2b=-18

b=-18/2

b=-9

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