look to cancel things. start off just from the top and bottom of the two fractions.
so now you're left with:
now you can do some cross canceling:
so you're left with:
no more canceling you can do. so just multiply out the top and bottom of the fraction.
Get rid of that fraction on the right.
Just simply multiply by :
Now just multiply the left hand side and get it equal to zero.
Then you're solving for m like a normal quadratic problem.
Keep in mind that m cannon be - 4 as it would make the bottom of the fraction zero in the original problem.