-13-12f=20-15f

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Solution for -13-12f=20-15f equation: 



-13-12f=20-15f

We move all terms to the left:

-13-12f-(20-15f)=0

We add all the numbers together, and all the variables

-12f-(-15f+20)-13=0

We get rid of parentheses

-12f+15f-20-13=0

We add all the numbers together, and all the variables

3f-33=0

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

3f=33

f=33/3

f=11

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