7b+5b=84

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Solution for 7b+5b=84 equation: 



7b+5b=84

We move all terms to the left:

7b+5b-(84)=0

We add all the numbers together, and all the variables

12b-84=0

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

12b=84

b=84/12

b=7

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