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Ix - 3I = 7

x - 3 = 7
x = 7 + 3
x = 10

x - 3 =  -7
x = -7 + 3
x = -4

x1 < x2, maka
x1 = -4
x2 = 10

x2 - x1 = 10 - (-4) = 10 + 4 = 14

jawaban D