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f(g(x)) = 10x + 7
f(5x+3) = 10x + 7
f((5x+3-3)/5) = 10 . ((x-3)/5) + 7
f(x) = 2 . (x-3) + 7
f(x) = 2x - 6 + 7
f(x) = 2x + 1