20-7f=69

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Solution for 20-7f=69 equation: 



20-7f=69

We move all terms to the left:

20-7f-(69)=0

We add all the numbers together, and all the variables

-7f-49=0

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

-7f=49

f=49/-7

f=-7

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