Question 910990
{{{ 2m-nx=x+4}}} ...rearrange terms, isolate  {{{x}}} on one side


{{{ 2m-nx+nx=x+nx+4}}}


{{{ 2m-cross(nx)+cross(nx)=x+nx+4}}}


{{{ 2m=x+nx+4}}}


{{{ 2m-4=x+nx+4-4}}}


{{{ 2m-4=x+nx+cross(4)-cross(4)}}}


{{{ 2m-4=x+nx}}} ...factor out {{{x}}}


{{{ 2m-4=x(1+n)}}}


{{{ (2m-4)/(1+n)=x }}}