Hello I am PhD Dissertator at UW Madison I am working on this problem and I can't seem to find a nice way to combine these terms any suggestions?

I have this situation can I combine the following terms

DDDa = |d1-a1-p1/C|+|d1-a1-(p1+p2)/C|+|d1-a1-(p1+p2+p3)/C|

Thanks

Ian