your writing is so full of typos it's incomprehensible.
When you get an answer, test it to see whether it works in the original equation.
radicand equation d-1/3=4
d-1/3=4^
d-1/3=16
d=16-1=15
3d=15
d-5
1 answer
d-1/3=4^
d-1/3=16
d=16-1=15
3d=15
d-5
1 answer