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8X + 7x = 180°
15 X = 180°
X = 180/15 = 12 °
< K + < M = 180
< K + ( 6x + 7)°= 180°
< K + 6( 12) +7 = 180°
< K + 72° = 180°
< K = 180° - 72°
< K = 108°