Question

-x =x when x is7/6 verify it

Answer 1

$- x = x \\ \\ on \: putting \: x = \frac{7}{6} \\ \\ - \frac{7}{6} = \frac{7}{6}$

both are not equal

Answer 2

No it cant be possible .
If u are thinking by squaring both sides putting values give
49/36 = 49/36
But after square rooting both again gives the opposite signs . ..... means -x cant be equal to x.
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