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(__) + 0.21 = 18
18 - 0.21 = 17.79
17.79 + 0.21 = 18
Pero tu expones asi:
(__) x 0.21 = 18
18/0.21 = 85.71
85.71 x 0.21 = 18
Ahora ve tu cual de los dos es tu ejercicio. Suerte