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jadi
x + y = 100
x - y = 40 -
2y = 60
y = 60/2
y = 30
x + y = 100
x + 30 = 100
x = 100-30
x = 70
jadi x = 70
y = 30
x-y = 40
(40 + y) + y = 100
40 + 2y = 100
2y = 60
y = 30
x + y = 100
x + 30 = 100
x = 70