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x+y=23
2x+3y=49
hacemos reduccion:
-2(x+y=23)...........-2x-2y= -46
2x+3y=49.............2x+3y=49
y=3
si y=3
x+y=23
x+3=23
x=23-3
x=20
hay 20 bicicletas y 3 triciclos