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x - y = 1 ×2
2x + 5y = 16
2x - 2y = 2
dikurangi
-3y = 14
y = -4.66
2x + 5y = 16
2x + 5.-4.66 = 16
2x - 23.3 = 16
2x = 16 + 23.3
x= 39.3 ÷ 2
x= 19.65