f(-4)=5(-4)-12

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Solution for f(-4)=5(-4)-12 equation: 



f(-4)=5(-4)-12

We move all terms to the left:

f(-4)-(5(-4)-12)=0

We add all the numbers together, and all the variables

f(-4)+32=0

We multiply parentheses

-4f+32=0

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

-4f=-32

f=-32/-4

f=+8

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