f(-3)=2(-9)-1

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Solution for f(-3)=2(-9)-1 equation: 



f(-3)=2(-9)-1

We move all terms to the left:

f(-3)-(2(-9)-1)=0

We add all the numbers together, and all the variables

f(-3)+19=0

We multiply parentheses

-3f+19=0

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

-3f=-19

f=-19/-3

f=6+1/3

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