f(-3)=4(-3)+9

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Solution for f(-3)=4(-3)+9 equation: 



f(-3)=4(-3)+9

We move all terms to the left:

f(-3)-(4(-3)+9)=0

We add all the numbers together, and all the variables

f(-3)+3=0

We multiply parentheses

-3f+3=0

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

-3f=-3

f=-3/-3

f=1

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