Question 947604

{{{ 5x^2=x^2-4}}}

{{{ 5x^2-x^2=-4}}}

{{{ 4x^2=-4}}}

{{{ 4x^2/4=-4/4}}}

{{{ x^2=-1}}}

{{{ x=sqrt(-1)}}}

solutions:

{{{ x=i}}}

{{{ x=-i}}}