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motocicletas = y
x+y = 78
4x+2x= 200
sistema de ecuaciones método de reducción
(x+y = 78)-4
4x+2x= 200
-4x+-4y = -312
4x+2x= 200
----------------------
-2y=-112
112= 2y
56= y
reemplazamos
x+y = 78
x+56= 78
x= 78-56
x= 22
hay 22 autos y 56 motocicletas