78=15+9b

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Solution for 78=15+9b equation: 



78=15+9b

We move all terms to the left:

78-(15+9b)=0

We add all the numbers together, and all the variables

-(9b+15)+78=0

We get rid of parentheses

-9b-15+78=0

We add all the numbers together, and all the variables

-9b+63=0

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

-9b=-63

b=-63/-9

b=+7

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