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Jadi, 180 = 90 + (2x+17) + (x+4)
180 = 90 + 3x + 21
180 = 111 + 3x
180 - 111 = 3x
69 = 3x
x = 69 : 3 = 23
<M = x+4
<M = 23 + 4 = 27 derajat
Maaf kalau ada kesalahan :)
180 - 90 = 3x + 21
90 - 21 = 3x
69 = 3x
x = 23°
jadi sudut M = 23 + 4 = 27°