f(-9)=10(-9)+4

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Solution for f(-9)=10(-9)+4 equation: 



f(-9)=10(-9)+4

We move all terms to the left:

f(-9)-(10(-9)+4)=0

We add all the numbers together, and all the variables

f(-9)+86=0

We multiply parentheses

-9f+86=0

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

-9f=-86

f=-86/-9

f=9+5/9

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