f(-3)=3(-3)-7

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



f(-3)=3(-3)-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-3)+16=0

We multiply parentheses

-3f+16=0

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

-3f=-16

f=-16/-3

f=5+1/3

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