1.(5x-6y+8z)+7x-9z)-(2y+9z-10)
2. (13a-8b)+(12a+9b)
3.(15i+14b+13k)+(-30i-45j+51k)
2. (13a-8b)+(12a+9b)
3.(15i+14b+13k)+(-30i-45j+51k)
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(5x - 6y + 6z) + (7x - 9z) - (2y + 9z + 10)
= 5x + 7x - 6y - 2y + 6z - 9z - 9z + 10
= 12x - 8y - 13z + 10
2.
(13a-8b)+(12a+9b)
13a-8b+12a+9b
25a+b
3.
15i-30i+13k+51k+14b-45j = -15i+64k+14b-45j