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x = 4 +y
x +y = 50
(4 +y) +y = 50
4 +2y = 50
2y = 50 -4
2y = 46
y = 46/2
y = 23
x +y = 50
x +23 = 50
x = 50 -23
x = 27
Pembuktian :
==> x +y = 50
27 +23 = 50
==> x -y = 4
27 -23 = 4
Jadi, bilangan tersebut adalah 27 dan 23.