25=7+f

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Solution for 25=7+f equation: 



25=7+f

We move all terms to the left:

25-(7+f)=0

We add all the numbers together, and all the variables

-(f+7)+25=0

We get rid of parentheses

-f-7+25=0

We add all the numbers together, and all the variables

-1f+18=0

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

-f=-18

f=-18/-1

f=+18

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