f(-2)=2(-2)+6

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Solution for f(-2)=2(-2)+6 equation: 



f(-2)=2(-2)+6

We move all terms to the left:

f(-2)-(2(-2)+6)=0

We add all the numbers together, and all the variables

f(-2)-2=0

We multiply parentheses

-2f-2=0

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

-2f=2

f=2/-2

f=-1

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