7b-78b=-15

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Solution for 7b-78b=-15 equation: 



7b-78b=-15

We move all terms to the left:

7b-78b-(-15)=0

We add all the numbers together, and all the variables

-71b+15=0

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

-71b=-15

b=-15/-71

b=15/71

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