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bilangan kedua = y
x = 3y
maka
x + y = 24
3y + y = 24
4y = 24
y = 24/4 = 6
maka x = 3y = 3 × 6 = 18
maka y = y = 6
selisih
x-y = 3y - y = 18-6 = 12