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-3x + y = -1 hasilnya kedua persamaan +
5y = 10
y = 2
3x + 4y = 11
3x + 4(2) = 11
3x = 11 - 8
3x = 3
x = 1
jadi nilai dari 2x - 7 = 2 (1) - 7 = -5