12-8-15f=13-12f

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Solution for 12-8-15f=13-12f equation: 



12-8-15f=13-12f

We move all terms to the left:

12-8-15f-(13-12f)=0

We add all the numbers together, and all the variables

-15f-(-12f+13)+12-8=0

We add all the numbers together, and all the variables

-15f-(-12f+13)+4=0

We get rid of parentheses

-15f+12f-13+4=0

We add all the numbers together, and all the variables

-3f-9=0

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

-3f=9

f=9/-3

f=-3

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