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    $\begingroup$ Are there any assumptions for n and b? I guess that n is a non-negative integer, but b? $\endgroup$ Commented Jan 21, 2017 at 19:28
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    $\begingroup$ Obviously this system cannot be solved analyticaly. It's not a MA problem. The solution can be found numericaly only. $\endgroup$ Commented Jan 21, 2017 at 20:25
  • $\begingroup$ This problem is equivalent to Solve[Sin[x] == x, x], which has only one solution. FindInstance[Sin[x] == x, x] gives it, {{x -> 0}}. $\endgroup$ Commented Jan 21, 2017 at 20:37
  • $\begingroup$ @mattiav27 n is a non-negative integer, b is given and b<a, both non-negative $\endgroup$ Commented Jan 21, 2017 at 21:47