Solve problem

[MC_BT_18]

Hi guys. I'm having some trouble solving for a variable mx (see attached worksheet). I think it's pretty straight forward and I'm just not seeing what i'm doing wrong..

I tried using a solve block, but didn't work, I'm probably just writing it up wrong.. I'm using mathcad 5 btw

[Werner_E]

You may either solve the equation symbolically before you assign values to variables or you may turn variables which depend on mx into functions of mx.

But the first step must be making the equation unit consistent.

You can't add a dimensionless number and energy and expect the result being force