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= 6x + 7y - 5z - 2x + 3y - 4z
= 6x - 2x + 7y + 3y - 5z - 4z
= 4x + 10y - 9z
2.
9p - 2q + 9r + (4p + 4q - 6r)
= 9p - 2q + 9r + 4p + 4q - 6r
= 9p + 4p - 2q + 4q + 9r - 6r
= 13p + 2q + 3r
2.13p+2q+3r