I really need help on this one.
m<M + m<N = 180°11x + 6x - 7 = 18011x + 6x = 180 + 717x = 187x = 187 : 17 = 11m<M = m<O = 11x = 11 · 11 = 121°m<N = m<L = 6x-7 = 6 · 11 -7 = 66 - 7 = 59°Check : 121° + 59° = 180° OK !