f(-2)=7

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Solution for f(-2)=7 equation: 



f(-2)=7

We move all terms to the left:

f(-2)-(7)=0

We multiply parentheses

-2f-7=0

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

-2f=7

f=7/-2

f=-3+1/2

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