-18=4f+7f

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Solution for -18=4f+7f equation: 



-18=4f+7f

We move all terms to the left:

-18-(4f+7f)=0

We add all the numbers together, and all the variables

-(+11f)-18=0

We get rid of parentheses

-11f-18=0

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

-11f=18

f=18/-11

f=-1+7/11

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