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= -4x < 2-7
= -4x < -5
= x > 5/4
tandanya di balik karna dibagi dengan tanda negatif
b. 3 < -x <8
= -x < 8-3
= -x < 5
= x< -5
c. -4 < -3 < 10
= -4+3-10 < 0
= -11