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untuk nilai positif
I2x-3I ≥ 7
I2xI ≥ 7+3
I2xI ≥ 10
IxI ≥ 10/2
IxI ≥ 5
untuk nilai negatif
I-2x+3I ≥ 7
I-2xI ≥ 7-3
I-2xI ≥ 4
I-xI ≥ 4/2
I-xI ≥ 2
IxI ≥ -2