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Samakan penyebut
= 8(x)/(8x-8) + 4x/(8x -8)
= (8x+4x)/(8x-8)
= 12x/(8x-8) dibagi 4 penyebut dan pembilang
= 3x/(2x-2)
Untuk x=4,
=3(4)/(2(4)-2)
= 12/6
= 2
Semoga membantu :)