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3x + y = 18 |x 3| ⇔ 9x + 3y = 54 +
⇒ 11x = 55
⇒ x = 5
2x - 3y = 1
2(5) - 3y = 1
10 - 3y = 1
3y = 10 - 1
3y = 9
y = 9 : 3
⇒ y = 3