18-7f=9

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Solution for 18-7f=9 equation: 



18-7f=9

We move all terms to the left:

18-7f-(9)=0

We add all the numbers together, and all the variables

-7f+9=0

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

-7f=-9

f=-9/-7

f=1+2/7

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