esta es la respuesta
x + 880 = 9·(x - 40)
x + 880 = 9x - 360
880 + 360 = 9x - x
1240 = 8x
1240/8 = x
155 = x
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solo podria ser 103
esta es la respuesta
x + 880 = 9·(x - 40)
x + 880 = 9x - 360
880 + 360 = 9x - x
1240 = 8x
1240/8 = x
155 = x