f(-9)=-5(-9)+4

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Solution for f(-9)=-5(-9)+4 equation: 



f(-9)=-5(-9)+4

We move all terms to the left:

f(-9)-(-5(-9)+4)=0

We add all the numbers together, and all the variables

f(-9)-49=0

We multiply parentheses

-9f-49=0

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

-9f=49

f=49/-9

f=-5+4/9

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