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x+y=24
4x+2y=84
hacemos reduccion
-2(x+y=24)............................-2x-2y= -48
4x+2y=84..............................4x+2y=84
2x=36..........x=36/2..............x=18
si x=18
x+y=24
18+y=24
y=24-18
y=6
hay 18 carros y 6 motocicletas