3b+9=b+15

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Solution for 3b+9=b+15 equation: 



3b+9=b+15

We move all terms to the left:

3b+9-(b+15)=0

We get rid of parentheses

3b-b-15+9=0

We add all the numbers together, and all the variables

2b-6=0

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

2b=6

b=6/2

b=3

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