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denominador = y
PLANTEO DE LAS ECUACIONES:
1) (x+1)/y = 1/3
2) x/(y+1) = 1/4
1) (x+1)/y = 1/3
3(x+1) = y
y = 3x+3
2) x/(y+1) = 1/4
4x = y+1; sustituyendo y:
4x = 3x+3+1
4x-3x = 3+1
x = 4
y = 3x+3
y = 3(4)+3
y = 12+3
y = 15
Por lo tanto la fracción es:
x/y = 4/15