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240 - 3X = 25 x 6
240 - 3x = 150
Separamos los números de las incógnitas:
3x = 90
x = 90/3
x = 30
Comprobamos:
240 - 3(30)= 25 x 6
240 - 90 = 150
150 = 150
Es correcto.
saludos
240 - 3x = 150
240 - 150 = 3x
90 /3 = x
30 = x
el número es el 30
espero que te sirva, salu2!!!!