Solved
Hai please answer this question
If
Vu=0.383*3000*(1275-d)
Vc=0.36*3000*d
Vu ≤ Vc
Then value of "d" ll be greater than equal to what ?
If
Vu=0.383*3000*(1275-d)
Vc=0.36*3000*d
Vu ≤ Vc
Then value of "d" ll be greater than equal to what ?
You may user the symbolic "solve" to do the job:

And if you don't mind the red errors thrown by the numerics, you can define Vu und Vc as variables and not as functions in d, if you prefer it that way

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