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3x/4 - x/6= 420
9x/12 - 2x/12= 420
7x/12= 420
7x= 12(420)
7x= 5040
x= 5040/7
x= 720
3/4 del número excede en 420=
3/4 x - 420
A su sexta parte= 1/6 x
Haciendo la igualdad
3/4 x - 420= 1/6 x
3/4 x - 1/6 x = 420
9/12 x - 2/12 x = 420
7/12 x = 420
7x = 420×12
x= 5040/7
x= 720
R. El número es 720