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x = 3y-1 ⇔ y = 1/3(x + 1)
(3y-1)y = 140 ⇔ x(x/3 + 1/3)
3y² - y = 140 ⇔ x²/3 + x/3
x = 20
y = 7
20 - 7 = 13