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= 25x + 40xy + 63z - 21x + 18xy + 26x
= 25x -21x +36x + 40xy +18xy +63z
= 40x + 58xy +63z
= 25x + 40 xy + 63z - 21x + 18xy + 36x
= (25-21+36)x + (40+18) xy + 63z
= 40x + 58xy + 63z