66=3f-21

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Solution for 66=3f-21 equation: 



66=3f-21

We move all terms to the left:

66-(3f-21)=0

We get rid of parentheses

-3f+21+66=0

We add all the numbers together, and all the variables

-3f+87=0

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

-3f=-87

f=-87/-3

f=+29

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