Answer:
1. 8m + -20m
= 8m - 20m
= -12m
2. (-3x) +8x + (-10x)
= -3x + 8x - 10x
= -5x
3. (3x+4) + (7x-8)
= 3x + 7x + 4 - 8
= 10x - 4
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Answers & Comments
Answer:
1. 8m + -20m
= 8m - 20m
= -12m
2. (-3x) +8x + (-10x)
= -3x + 8x - 10x
= -5x
3. (3x+4) + (7x-8)
= 3x + 7x + 4 - 8
= 10x - 4