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2do numero = y
PLANTEO DE LAS ECUACIONES
x + 3y = 17 (3)
3x - 2y = 7 (-1)
3x + 9y = 51
-3x + 2y = -7
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11y = 44
y=44/11
y = 4
x + 3y = 17
x= 17-3y
x= 17-3(4)
x= 17-12
x= 5