Besar KML adalah? jawab dong.cara kerjanya lagi yah

<M = 90 – <N
      = 90 – (6x + 40)
      = 90 – 6x – 40
      = 50 – 6x

90 = <K + <L + < M
90 = 85 + 3x + 50 – 6x
90 = 135 – 3x
3x = 135 – 90
3x = 45
 x  = 45/3
 x  =  15

<M = 50 – 6x
      = 50 – 6(15)
      = 50 – 90
      =   -40

maaf kalau salah