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48000 :(5 x a +260) - 18+ 30

Răspuns :

48000:(5·a+260)=30+18; 48000:(5·a+260)=48; 5·a+260=48000:48; 5·a+260=1000; 5·a=1000-260; 5·a=740; a=740:5; a=148