Computing for a particular numerical value

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After using a solve command I can get the result as:
x =
(5941415241525099*R)/2251799813685248000 + 250
Now after second solve command, I can calculate the value of R as:
R =
Now I want to compute x for this particular value of R. (If I am typing just "x" it displays the answer in terms of "R" only).
Any kind of help in this matter will be appreciated.

Risposta accettata

Matt Fig
Matt Fig il 10 Ago 2012
Modificato: Matt Fig il 10 Ago 2012
Use the SUBS command.
syms a x
s = solve(x^3 + a*x + 1)
a = 5;

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