f(-4)=2(-4)-8

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Solution for f(-4)=2(-4)-8 equation: 



f(-4)=2(-4)-8

We move all terms to the left:

f(-4)-(2(-4)-8)=0

We add all the numbers together, and all the variables

f(-4)+16=0

We multiply parentheses

-4f+16=0

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

-4f=-16

f=-16/-4

f=+4

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