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f(x) = 2x - 7g(x) = -4x + 6
f.g(-2) = f(g(-2))
g(-2) = -4*-2 + 6 = 8 + 6 = 14
so f.g(-2) = f(14) = 2*14 - 7 = 28 - 7 = 21.