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907 :(5a +1)=10rest 7

Răspuns :

907:(5a+1) = 10 r 7
907=10(5a+1) + 7
900-7=10(5a+1)
900=10(5a+1)
5a+1=900/10
5a+1=90
5a=90-1
5a = 89
a=89/5