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M= 5x
S=x
D= 4X
M+S+D=780
5X+X+4X=780
x=78
luego D= 4x = 4(78)
D= 312
Minuendo 5x
Sustraendo x
Diferncia 5x - x = 4x luego
5x + x + 4x = 780
10x = 780
x = 780/10
x = 78 78 * 5 = 390
390 - 78 = 312
R/ La diferencia es 312
Pruebas 78 es la quinta parte de 390
390 + 78 + 312 = 780