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a+b=30
a-b = 6 +
2a = 36
a = 36/2
a = 18
a+b = 30
b = 30-a
b = 30 - 18
b = 12
x-y=6
--------- -
2y = 24
y= 12
x+y=30
x+12=30
x= 30-12 = 18
bilangannya = 12 dan 18