21+15f=66

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Solution for 21+15f=66 equation: 



21+15f=66

We move all terms to the left:

21+15f-(66)=0

We add all the numbers together, and all the variables

15f-45=0

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

15f=45

f=45/15

f=3

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