m = 4x + 3
(m - 3)/4 = x
f(g(x)) = 8x - 6
f(m) = 8((m-3)/4) - 6
f(m) = 2m - 6 - 6
f(x) = 2x - 12
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m = 4x + 3
(m - 3)/4 = x
f(g(x)) = 8x - 6
f(m) = 8((m-3)/4) - 6
f(m) = 2m - 6 - 6
f(x) = 2x - 12