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2x-x-9= 18
x- 9= 18 Ecuación de 1er nivel
x= 18+9
x= 27
comprobación
2x-9= x+18
2(27)-9= 27+18
54-9= 45
45=45
2x-9=x+18
2x - x = 18 + 9
x = 27
Respuesta.
x = 27
COMPROBAMOS LA SOLUCIÓN
2x - 9 = x + 18
2 (27) - 9 = 27 + 18
54 - 9 = 45
45 = 45
La solución es correcta!!!