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=(4+1)m+(-1+1)n
=5m
2. -3a + (-7b) + (-b) - (-6a)
=(-3+6)a+(-7-1)b
=3a-8b
3. 2b + (-2a) - 2b - (-2a)
=(-2+2)a+(2-2)b
=0
1. 4m + m-n +n = 5m
2.-3a + 6a -7b -b = 3a - 8b
3. 2b-2b-2a+2a = 0