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-7m - 3m + 5m = -5m
15m + 4n - 5m + 9n = 10m + 13n
3+4m+5m=214m+5m=21-39m=18m=18/9m=2
It is: 9m +8 -4m +7 -5m = 15
-5m-3+4 = 11 -5m = 11+3-4 -5m = 10 m = -2