Desarrollamos:
2x - 9 = x + 18
2x - x = 18 + 9
x = 27
Respuesta: 27
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2x-x-9=x-x+18
x-9=18 /+9
x-9+9=18+9
x=27
Desarrollamos:
2x - 9 = x + 18
2x - x = 18 + 9
x = 27
Respuesta: 27