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-X - 16Y = 8 (2)
La (2)x7: -7X - 112Y = 56
(1) : 7X - 15Y = 1
+(2)x7:-7X - 112Y = 56
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-127Y = 57
-127Y = 57
Y = -57/127.
Reemplazo el valor de Y en (1)
7X - 15Y = 1
7X = 1 + 15Y
7X = 1 + 15(-57/127)
7X = 1 - 855/127
7X = 127/127 - 855/127
7X = -728/127
X = -728/(127x7)
X = -104/127
Rta: X = -104/127; Y = -57/127