20+9f=83

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Solution for 20+9f=83 equation: 



20+9f=83

We move all terms to the left:

20+9f-(83)=0

We add all the numbers together, and all the variables

9f-63=0

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

9f=63

f=63/9

f=7

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