How to solve this system?

[COB160]

(07-06-2017 10:19 PM)Helge Gabert Wrote:  Where is the problem?

If m1, m2, r not equal zero, just take the inverse and multiply out.

p1=(-m2+r)/(m1*r+m1-m2*r-m2)
p2=(m1-r)/(denom. as above)

and observe r>m2 and m1>r (which is NOT what you wanted, but you can check various combinations of negative numerator divided by negative denominator and see if find combinations which satisfy m1<r<m2).

That is exactly my problem! Can I directly get the result I am searching for? Maybe by using solve function with assumptions on parameters (assumptions that I actually am not able to do...)