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su resultado seria
x - -0.45 = 3 / 8
x - - 45 /10 =convertimos - 0.45 a fracción que seria 45 / 10
x - - 9 / 5 =simplificamos a la quinta su resultado - 9/ 5
x - -9/5 = 3/8
x = -9/5 + 3/ 8
x = - 57 /40
prueba
-57 / 40 - 9 / 5 = 3/ 8
3 /8 = 3/8
saludos