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jadi
4(5x -1) = 3(4x +7)
20x -4 = 12x +21
8x = 25
Samakan penyebut
(5x - 1)4 = (4x + 7)3
20x - 4 = 12x + 21
20x - 12x = 21 + 4
8x = 25
x = 25/8
x = 3 1/8