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(x+30)(8)=x+450
8x+240=x+450
8x-x=450-240
7x=210
x=210/7
x=30
el numero es el 30
x=número.
(x+30) .8 = x+450
8x+240 = x+450
8x-x = 450-240
7x = 210
x = 210/7
x = 30.
Comprobación.
(30+30) .8 = 30+450
60.8 = 480.
480 = 480.
Respuesta.
El número es 30.