I have a radicand equation 3-s=3
There is an index of 3
3-s=3times3tomes 3
3-s=27
s=9
Please, please, try to use standard notation
Do you mean
(3-s)^(1/3) = 3 ???????
if so raise both sides of the equation to the third power
(3 - s)^1 = 3-s = 27
s = 3 - 27
s = -24