7=8-f

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Solution for 7=8-f equation: 



7=8-f

We move all terms to the left:

7-(8-f)=0

We add all the numbers together, and all the variables

-(-1f+8)+7=0

We get rid of parentheses

1f-8+7=0

We add all the numbers together, and all the variables

f-1=0

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

f=1

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