50/3 (150 a + 20 b + 3 c)=15 and 1000 a+100 b+10 c=3 and a+b+c=k solve for a,b,c50/3 (150 a + 20 b + 3 c)=15 and 1000 a+100 b+10 c=3 and a+b+c=k solve for a,b,c

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