f(-1)=12-2(-3)

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Solution for f(-1)=12-2(-3) equation: 



f(-1)=12-2(-3)

We move all terms to the left:

f(-1)-(12-2(-3))=0

We add all the numbers together, and all the variables

f(-1)-18=0

We multiply parentheses

-1f-18=0

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

-f=18

f=18/-1

f=-18

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