There is no such number.
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0 It's the only number when added/subtracted/multiplied/divided by itself doesn't change in value.
('x' times 'x') plus 'x' = 30x2 + x - 30 = 0(x + 6) (x - 5) = 0x = -6and/orx = 5
-0.5625
Double means something is multiplied by two or added to itself
43