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4x+5y=1 |5|→ 20x + 25y = 5
……………………………………………
-17y = -17
y = 1
substitusikan
5x+2y=-3
5x+2(1)= -3
5x+2= -3
5x = -3-2
5x = -5
x= -1
maka nilai x-y = -1 - 1 = -2
maaf jika salah