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2) -9m + 3n
3)-5x-3y-3v
✉ -m+5n -8m-2n = -m - 8m + 5n- 2n
= -9m + 3n
✉ -10x - 3y - (-5x) - 3y
= -10x - 5x - 3y - 3y
= -15x