عدد حقيقى اذا طرح منه ضعف معكوسه الضربى كان الناتج مساويا الواحد

If a real number is subtracted from its reciprocal double, the result is equal to one:
Solution:
Assume the number is s
Reciprocal double = s/1
So,
s – (s/2) = 1
s^2 – 2 = s
s^2 – s – 2 = 0
(s – 2)(s + 1) = 0
Therefore,
s = 2
s = -1
So, the number is either 2 or -1.