9b+4b=15

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Solution for 9b+4b=15 equation: 



9b+4b=15

We move all terms to the left:

9b+4b-(15)=0

We add all the numbers together, and all the variables

13b-15=0

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

13b=15

b=15/13

b=1+2/13

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