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2014-08-23T10:31:32+03:00
X:12=c1 rest 7=>regula impartirii cu rest
x=12×c1+7
x-7=12×c1=> x-7∈ M12 de 3 cifre (108,120,132,144,...984)
x-7=108
x=115
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.
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x-7= 984
x=991
S=115+127+139+...991
2 5 2