3f(1)=15

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Solution for 3f(1)=15 equation: 



3f(1)=15

We move all terms to the left:

3f(1)-(15)=0

We add all the numbers together, and all the variables

3f-15=0

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

3f=15

f=15/3

f=5

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