What is the difference of f and g?

f (x) = - 20x g (x) = 2x+9

a. (f-g) (x) = 22x+9

b. (f-g) (x) = 18x+9

c. (f-g) (x) = - 22x+9

d. (f-g) (x) = - 22x-9

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