f(-7)=13(-7)+11(-7)-21

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Solution for f(-7)=13(-7)+11(-7)-21 equation: 



f(-7)=13(-7)+11(-7)-21

We move all terms to the left:

f(-7)-(13(-7)+11(-7)-21)=0

We add all the numbers together, and all the variables

f(-7)+189=0

We multiply parentheses

-7f+189=0

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

-7f=-189

f=-189/-7

f=+27

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