f(-2)=2+2

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



f(-2)=2+2

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-2)-4=0

We multiply parentheses

-2f-4=0

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

-2f=4

f=4/-2

f=-2

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