1) 5 (a-x) +b (a-x) + c (a-x) = (a-x)(5+b+c)
2) (xp - px - p) + (-xc+cx-c) = p(x-x-1) + c(-x + x -1) = p(-1) + c (-1) = -(p +c)
1) 5 (a-x) +b (a-x) + c (a-x) = (a-x)(5+b+c)
2) (xp - px - p) + (-xc+cx-c) = p(x-x-1) + c(-x + x -1) = p(-1) + c (-1) = -(p +c)