f(-2)=7-9(-2)

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Solution for f(-2)=7-9(-2) equation: 



f(-2)=7-9(-2)

We move all terms to the left:

f(-2)-(7-9(-2))=0

We add all the numbers together, and all the variables

f(-2)-25=0

We multiply parentheses

-2f-25=0

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

-2f=25

f=25/-2

f=-12+1/2

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