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5x - 6y = -8 x3
15x + 25y = 105
15x - 18y = -24
43y = 129
y = 3
3x + 5y = 21 x6
5x - 6y = -8 x5
18x + 30y = 126
25x - 30y = -40
43x = 86
x = 2
Nilai dari 5x-y = 5(2) - 3 = 10-3 = 7