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5x - 2y =. 21
___________+
4x = 12
x = 12/4
x = 3
jika x = -3 maka
-x + 2y = -9
-3 + 2y = -9
2y = -9 + 3
2y = -6
y = -3
2x - 3y =
2(3) - 3(-3)
6 + 9 = 15
jadi, 2x - 3y = 15