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4x - 3y = 15 × -2
21x + 6y = 57
-8x + 6y = -30
dikurangi = 29x = 87
× = 3
21x + 6y = 57
21.3 + 6y = 57
63 + 6y = 57
6y = -6
y = -1
3× - 2y
3.3 - 2.-1
9+2 = 11