20≤4x−16<36
20+16≤4x<36+16
36≤4x<52 |:4
36/4≤4x/4<52/4
9≤x<13
x∈ [9, 13)
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20≤4x−16<36
20+16≤4x<36+16
36≤4x<52 |:4
36/4≤4x/4<52/4
9≤x<13
x∈ [9, 13)