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y = 17/6 - (2/7 + 3/5)
y = 17/6 - 31/35
y = 409/210
operaciones
2 3 10 + 21 31
-- + --- =-------------- = ----
7 5 35 35
7 1 14 + 3 17
--- + ---- = --------- = -----
3 2 6 6
17 31 595 - 186 409
--- - ---- = --------------= -------
6 35 210 210
y = 409/210
saludos