This is not a word problem and the equation "V=4/3TT(3.14)r3" is ambiguous on many levels.  We could assume that "r3" is intended as "r^3" but it is less certain what "4/3TT" indicates... could be "(4/3)T^2"?  Anyway, 3 variables in one equation submitted as a word problem? 

The solver does allow specific variables to be solved for:

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