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x>20+50
x>70 (a)
30)[x-120]<11
-11<[x-120]<11
*-11<x-120
-11+120<x
109<x
*x-120<11
x<11+120
x<131
HP:{x║109<x<131}
Jadi, interval ketinggian sungai mengalir antara 109 cm dan 131 cm (d)