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80/2 = 40
selisih 4, 4/2 = 2
40 - 2 = 38
40 + 2 = 42
kedua bilangan tersebut adalah 38 dan 42
x-y=4
x=y+4
x+y=80
y+4+y=80
2y=80-4
2y=76
y=38
x+y=80
x+38=80
x=80-38
x=42
jadi 38 dan 42