vii. Add the following:
a) (7x+8y- 9z) + (5x + 4y - 10z)
b) (62 + 7b-8c) + (4a - b+ 2c)
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Step-by-step explanation:
a) (7x+8y- 9z) + (5x + 4y - 10z)
7x+8y- 9z + 5x + 4y - 10z
12x + 12y - 19 z
b) (62 + 7b-8c) + (4a - b+ 2c)
62 + 7b-8c + 4a - b+ 2c
62+ 4a +8b - 10c
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