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= 1/2x > 15 - 5
= 1/2x > 10
= x > 10 : 1/2
= x > 10 kali 2/1
= x > 20
2. 2 - (4 + x) > - 22
= 2 - 4 - x > -22
= -2 - x > -22
= -x > -22 + 2
= -x > -20
= x < 20