f(-8)=2(-8)+12

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Solution for f(-8)=2(-8)+12 equation: 



f(-8)=2(-8)+12

We move all terms to the left:

f(-8)-(2(-8)+12)=0

We add all the numbers together, and all the variables

f(-8)+4=0

We multiply parentheses

-8f+4=0

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

-8f=-4

f=-4/-8

f=1/2

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