20=66-f

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Solution for 20=66-f equation: 



20=66-f

We move all terms to the left:

20-(66-f)=0

We add all the numbers together, and all the variables

-(-1f+66)+20=0

We get rid of parentheses

1f-66+20=0

We add all the numbers together, and all the variables

f-46=0

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

f=46

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