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3y / x = 6x+6
5x / y = 2y+3
entonces
6x + 6 = 3y
2y + 3 = 5x
.....
6x - 3y = -6 ......I
2y - 5x = -3 ,.....II
multiplicas por dos arriba y 3 abajo
qudaria;
12x - 6y = -12
6y - 15x = -9
resolviendo quedaria
-3x=-21
x=7
ahora reemplazas en una de las ecuaciones ...x....para hallar y
6x - 3y = -6
6(7) - 3y = -6
42 - 3y = -6
-3y= -48
y=16
y=16 y x = 7
comprueba