3x / 2y = 6 / 10
x / y = 6 * 2 / (10 * 3) = 2 / 5
(7x - 2y) / 2y = 7x / 2y - 2y / 2y = 7/2 * x/y - 1 = 7/2 * 2/5 - 1 = 7/5 - 5/5 = 2/5
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3x / 2y = 6 / 10
x / y = 6 * 2 / (10 * 3) = 2 / 5
(7x - 2y) / 2y = 7x / 2y - 2y / 2y = 7/2 * x/y - 1 = 7/2 * 2/5 - 1 = 7/5 - 5/5 = 2/5