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diturunkan 4°C ⇒ 9°C - 4°C = 5°C
dinaikkan 5°c ⇒ 5°C + 5°C = 10°C
9-4+5 = 10
4=0
5=10
10-0=10, 10+10=20
atau
9-4=5, 5+5=10
jawabannya antara 20 atau 10