The answer is 2xy + 2856x^2y^2
Cymath.com works wonders my friend.
So what you can do is reverse all the operations to get the variable on one side and all the numbers on the other.
So first subtract 5 from both sides.
5 - 5 - m = -75 - 5
-m = -80
Then divide both sides by -1
-m / -1 = -80 / -1
m = 80
Unless I understood the question wrong and it would just be m.
X = 1, 1.43
Sorry if its wrong!!