-42=-9f+-15

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Solution for -42=-9f+-15 equation: 



-42=-9f+-15

We move all terms to the left:

-42-(-9f+-15)=0

We add all the numbers together, and all the variables

-(-9f-15)-42=0

We get rid of parentheses

9f+15-42=0

We add all the numbers together, and all the variables

9f-27=0

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

9f=27

f=27/9

f=3

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