f(-5)=5(-5)-20

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Solution for f(-5)=5(-5)-20 equation: 



f(-5)=5(-5)-20

We move all terms to the left:

f(-5)-(5(-5)-20)=0

We add all the numbers together, and all the variables

f(-5)+45=0

We multiply parentheses

-5f+45=0

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

-5f=-45

f=-45/-5

f=+9

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