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3x – 2y = 21 | x2
2x + 3y = 1 | x3

Eliminasi X
6x – 4y = 42
6x + 9y = 3
dikurangi
-13y = 39
y = -13

Substitusi
2x + 3y = 1
2x + 3.-13 = 1
2x = 40
x = 20