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x + y = 16
x - y = 4 +
2x = 20
x = 10
Subtitusi x = 10
x + y = 16
10 + y = 16
y = 16-10
y = 6
Maaf kalau salah
X - Y=4
__________-
2Y = 12
Y =6
X+Y= 16
X+6= 16
X= 10