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f(x) = f(g)
f(x) = 2 - a/2(2 - (a -3)x)
2 - a/2x = 2 - a/(4 - 2ax + 6x)
4x/2x - a/2x = 2(4a - 2ax + 6x)/(4a - 2ax + 6x) - a/(4a - 2ax + 6x) --> samakan penyebut
(4x - a)/2x = (4a - 4ax + 12x - a)/(4a - 2ax + 6x)
(4x - a)(4a - 2ax + 6x) = 2x(4a - 4ax + 12x)
16ax - 8ax² + 24x² - 4a² - 2a²x - 6ax = 8ax - 8ax² + 24x²
24x² - 24x² - 8ax² + 8ax² + 16ax - 8ax - 6ax - 2a²x = 0
2ax - 2a²x = 0
ax(2 - 2a) = 0
2 - 2a
2a = 2
a = 1