Subtract the following:
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Step-by-step explanation:
iii) 6a-9b-10c+10-(5a-8b+4c)
6a-5a-9b+8b-10c-4c+10
a-b-14c+10
iv) 2x-3y+4z-(6x-9y-8z+4)
2x-6x-3y+9y+4z+8z-4
-4x+6y+12z-4
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