Given the parent functions f(x) = 3x + 2 and g(x) = 5x − 10, what is g(x) − f(x)?

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Given the parent functions f(x) = 3x + 2 and g(x) = 5x − 10, what is g(x) − f(x)?
A. g(x) − f(x) = 5x − 8 − 3x
B. g(x) − f(x) = 5x − 12 − 3x
C. g(x) − f(x) = 3x − 8 − 5x
D. g(x) − f(x) = 3x + 12 − 5x