(ak+1):(a+k)=(bk+1):(b+k+2)=(ck+2):(c+k+3)=n;a+b+c=12;k=multipkle of 2?

(ak+1):(a+k)=(bk+1):(b+k+2)=(ck+2):(c+k+3)=n;a+b+c=12;k=multipkle of 2?
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Homework. I don’t do it.
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