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Verified answer
Teori Bilangana + b = 100
3a - b = 20
________ +
4a = 120
a = 30
Maka
30 + b = 100
b = 70
3a - b = 20
___________ +
4a = 120
a = 120/4
a = 30
a + b = 100
30 + b = 100
b = 100 - 30
b = 70