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2015-10-09T21:53:41+08:00
Fg(x) = 6x -9
f[g(x)] = 6x -9
3g(x) -5 = 6x -9
3g(x) = 6x -9 +5
g(x) = (6x -4) /3
g(x) = 2x -(4/3)
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