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x - y = 4
*x - y = 4
x = 4 + y
x * y = 221
(4 + y) * y = 221
4y + = 221
+ 4y - 221 = 0
(y - 17) (y + 13) = 0
(y - 17) = 0 (y + 13) = 0
y - 17 = 0 y + 13 = 0
y = 17 y = -13
El numero mayor es 17 :)