Question 199993
-3/x = x/-3
.
cross multiply ( or  multiply  thru  by  - 3x)
.
9 = x^2
.
take  square  root  of  both  sides
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+/- 3  = x
.
check  by  subst  into  original
+3,,,,,,,-3/3 = 3/-3 = -1,,,,,,ok
-3,,,,,,,,-3/-3 =-3/-3 = 1,,,,,ok