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4x + 2y = 22 ....(2)
2y = 22 - 4x.....(3) -> masukan ke rumus pertama
3x - 2y = 6
3x - (22 - 4x) = 6
3x - 22 + 4x = 6
7x = 28
x = 4 -> masukan ke rumus ketiga
2y = 22 - 4x
2y = 22 - 4(4)
2y = 22 - 16
2y = 6
y = 3