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(x) + (2x-4) + 6 + 7 = 24
3x - 4 = 24 - 6 - 7
3x = 11 + 4
3x = 15
x = 3
2x - 4 = 2.3 - 4 = 6 - 4 = 2
jangkauan = nilai max - nilai min
= 7 - 2
= 5