f(-2)=5(-2)+20

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Solution for f(-2)=5(-2)+20 equation: 



f(-2)=5(-2)+20

We move all terms to the left:

f(-2)-(5(-2)+20)=0

We add all the numbers together, and all the variables

f(-2)-10=0

We multiply parentheses

-2f-10=0

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

-2f=10

f=10/-2

f=-5

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