Answer:
Explanation:
1) 7x + 11x = 18x
2) 3x - 2y + 4z - 2x - 3y + 5z + 6x + 2y - 3x
= 3x - 2x + 6x - 3x - 2y - 3y + 2y + 4z + 5z
= 4x - 3y + 9z
1)18x
2)4x-3y+9z
i hope this helps
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