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-2x+3y=-16. kali 3
6x + 8y = 14
-6x + 9y = - 48
---------------------- +
17y = -34
y = -2
3x + 4y = 7
3x + 4(-2) = 7
3x - 8 = 7
3x = 7 + 8
3x = 15
x = 5
Nilai
2x-7y
2(5) - 7(-2)
10 + 14
24