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