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1. To make is equation valid, T should be equal or bigger than 5
2. The biggest possible value of T is 9, 9+9 is 18 which shows that F is always 1
-This further expands on to the fact that T,W,O,U,R are not 1
3.O+O=R or O+O=10+R
-O>4 or O<5
4.W+W=U or W+W+1=U
-W>4 or W<5

In conclusion the solution must contain all of these qualities
-T>= 5
-F=1
-O>4 or O<5
-W>4 or W<5