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angka 1 = x
angka 2 = y
x-y = 15
x = y + 15
xy = 1000
(y+15) y = 1000
y^2 + 15 y - 1000 = 0
(y+40) (y-25)
y=-40 atau y=25
tinggal cari x
x = y + 15
= (-40) + 15 = -25
atau
x = y + 15
= 25 + 15 = 40