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3m + 7m + 1 = 10m + 1
-7m - 3m + 5m = -5m
If 7m = 4n+2 and 7m+2 = 8 m = 6/7 and n = 1
4c2 + 5c + 2c = 4c2 + 7c = c(4c + 7)
15 ac + 20 bc + 6 ad + 8 bd =3a (5c + 2d) + 4b (5c + 2d) =(3a + 4b) (5c + 2d)