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4+2.Y = 5.S+9
4+2.(7-6S) = 5S+9
4+14-12S = 5S+9
18-12S = 5S+9
-12S-5S = 9-18
-17S = -9
S = 9/17 → Y = 7-6.S = 7-6.9/17 = 7-54/17 = 119-54/17
= 65/17 = 3,82