f(-3)=3(-3)+1

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Solution for f(-3)=3(-3)+1 equation: 



f(-3)=3(-3)+1

We move all terms to the left:

f(-3)-(3(-3)+1)=0

We add all the numbers together, and all the variables

f(-3)+8=0

We multiply parentheses

-3f+8=0

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

-3f=-8

f=-8/-3

f=2+2/3

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