20f-89=631

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Solution for 20f-89=631 equation: 



20f-89=631

We move all terms to the left:

20f-89-(631)=0

We add all the numbers together, and all the variables

20f-720=0

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

20f=720

f=720/20

f=36

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