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4x - 3y = 15 | dikali 2| 8x - 6y = 30 +
29x = 87
x = 3
7x + 2y = 19
21 + 2y = 19
2y = - 2
y = -1
3x - 2y = 3(3) - 2 (-1) = 9 + 2 = 11