Question 849573
With just that much information, you cannot have a value for c or d.  You can only solve for c or d.


{{{4cx-5c=-12x+d}}}
{{{c(4x-5)=-12x+d}}}
{{{highlight_green(c=(-12x+d)/(4x-5))}}}


Solving for d is simpler.
{{{d-12x=4cx-5c}}} symmetric property
{{{highlight_green(d=4cx-5c+12x)}}}