3b+9b=144

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Solution for 3b+9b=144 equation: 



3b+9b=144

We move all terms to the left:

3b+9b-(144)=0

We add all the numbers together, and all the variables

12b-144=0

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

12b=144

b=144/12

b=12

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