What value dose x equals -x?

Answer 1

First of all , you English Grammar is incorrect. The word 'dose' should be spelled as 'does'. The word 'dose' is a quantity of medicine as given to a patient.

Hence

x = -x

There is only one possibility to this question and the answer is '0' .

Because is x= 1

The -x would = -1 and 1 does not equal '-1'. Similarly for any other number.

Answer 2

x = -x if and only if x = 0.