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M = 57 - y
K = M
2y - 15 = 57 - y
2y + y = 57 + 15
3y = 72
y = 24
K = 2y - 15
K = 2(24) - 15
K = 48 - 15
K = 33 derajat
L = N
L = 360 - (2 x 33)
L = 360 - 66
L = 294 : 2 = 147
L = 147 derajat
N = 147 derajat