I need to solve equation in mod .what to do?

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Sakunrat Jaejaima
Sakunrat Jaejaima 2015-6-22
评论： Sakunrat Jaejaima 2015-6-22
I want to find d from 7*d mod 40 =1.
I need to solve equation in mod.what to do ?
I do
Syms d
Eqn=Mod(1,40)==7*d;
Sold=solve(Eqn,d)
But Answer is
1/7

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回答（2 个）

Torsten
Torsten 2015-6-22
Steven Lord
Steven Lord 2015-6-22
For a system this small? Brute force works fine.
d = 0:39;
d(mod(7*d, 40) == 1)

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