f(-9)=7(-9)+7

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



f(-9)=7(-9)+7

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-9)+56=0

We multiply parentheses

-9f+56=0

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

-9f=-56

f=-56/-9

f=6+2/9

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