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x+y=39
6x+8y=274
hacemos reduccion
-6(x+y=39).........-6x-6y= -234
6x+8y=724.........6x+8y=274
2y=40.......y=40/2.......y=20
si y=20
x+y=39
x+20=39
x=39-20
x=19
tiene 19 insectos y 20 arañas