f(-7)=(-7+8)-1

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Solution for f(-7)=(-7+8)-1 equation: 



f(-7)=(-7+8)-1

We move all terms to the left:

f(-7)-((-7+8)-1)=0

We add all the numbers together, and all the variables

f(-7)-(1-1)=0

We add all the numbers together, and all the variables

f(-7)=0

We multiply parentheses

-7f=0

f=0/-7

f=0

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