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3x - y = 3 (dikali 5)
--------------------
2x + 5y = 19
15x - 5y = 15
---------------------- +
17x = 34
x = 34/17
x = 2
masukkan ke dalam salah satu persamaan
3x - y = 3
3.2 - y = 3
y = 6 - 3
y = 3
semoga membantu....