f(-2)=-4+2(-2)

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



f(-2)=-4+2(-2)

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-2)+8=0

We multiply parentheses

-2f+8=0

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

-2f=-8

f=-8/-2

f=+4

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