f(-3)=-9+3

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



f(-3)=-9+3

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-3)-(-6)=0

We add all the numbers together, and all the variables

f(-3)+6=0

We multiply parentheses

-3f+6=0

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

-3f=-6

f=-6/-3

f=+2

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