3f(-7)=5

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Solution for 3f(-7)=5 equation: 



3f(-7)=5

We move all terms to the left:

3f(-7)-(5)=0

We multiply parentheses

-21f-5=0

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

-21f=5

f=5/-21

f=-5/21

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