f(-3)=12(-3)

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Solution for f(-3)=12(-3) equation: 



f(-3)=12(-3)

We move all terms to the left:

f(-3)-(12(-3))=0

We add all the numbers together, and all the variables

f(-3)+36=0

We multiply parentheses

-3f+36=0

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

-3f=-36

f=-36/-3

f=+12

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