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(Solved): Q2. (8 pts, Solving Congruences) Let a,b,d, and n>1 be arbitrary integers. 2.a. Prove that if ad ...



Q2. (8 pts, Solving Congruences) Let

a,b,d

, and

n>1

be arbitrary integers. 2.a. Prove that if

ad-=bd(modn)

, then

a-=b(mod(n)/(gcd(d,n)))

. 2.b. Solve

7x-=12(mod13)

for

xin{0,1,2,dots,12}

. 2.c. Solve

84x-38-=79(mod15)

for

xin{0,1,2,dots,14}

. 2.d. Solve

2x-=3(mod14)

for

xin{0,1,2,dots,13}

.



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