Why Does a Solution Exist for the Congruence Equation 59x + 15 ≡ 6 mod n?

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SUMMARY

The congruence equation 59x + 15 ≡ 6 mod n has a solution if and only if certain conditions regarding the integer n are met. Specifically, for a solution to exist, the greatest common divisor (gcd) of 59 and n must divide the constant term derived from rearranging the equation, which is -9. If n equals 59, no solution exists, as the gcd does not divide -9. Understanding the relationship between the coefficients and the modulus is crucial for determining the existence of solutions.

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Homework Statement


Let n be a positive integer. Consider the congruence equation 59x + 15 congruent to 6 mod n
For this equation, a solution x exits. Why?

Homework Equations


The Attempt at a Solution


there is a k such that
(59x +15) - 6 = kn
(59x +15) - kn = 6
59x - kn = 6 - 15
59x - kn = -9
there is a linear combination of 59 and k that gives -9
But then, I don't know if this is the right way to go and what to do now!
Thanks to help
 
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If n=59 there is no solution. You have to know something about n to decide whether there is a solution.
 

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