(3x + 9) : 4 = 63x + 9 = 243x = 15x = 5Jangkauan : max - minJ : 7 - 5 = 2
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(3x + 9) : 4 = 6
3x + 9 = 24
3x = 15
x = 5
Jangkauan : max - min
J : 7 - 5 = 2