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2n + 3n + 40 = 180
5n + 40 = 180
5n = 180 - 40
5n = 140
n = 140/5 = 28
n = 28 derajat
2. 4m + (3m+1) + (2m+1) = 180
4m + 3m + 1 + 2m + 1 = 180
4m + 3m + 2m + 1 + 1 = 180
9m + 2 = 180
9m = 180 - 2
9m = 178
m = 178/9 = 19,78 = 20
m = 20 derajat