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June 13th, 2017, 10:30 AM   #1
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Modular equation

Could you help me solve modular equations?

a)6x = 12 mod21

b)643x=1 mod2000
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June 13th, 2017, 12:13 PM   #2
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for b>a,
a mod b = a

x = 2
x = 1/643
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June 13th, 2017, 07:35 PM   #3
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a) x = 7k + 2; k = 0, 1, 2, 3 ... integer

b) I don't see an integer solution
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June 13th, 2017, 07:38 PM   #4
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2. x = 507 + 2000a, a $\in$ Z.
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