5b+7b=120

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Solution for 5b+7b=120 equation: 



5b+7b=120

We move all terms to the left:

5b+7b-(120)=0

We add all the numbers together, and all the variables

12b-120=0

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

12b=120

b=120/12

b=10

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