ABCD= SUDUT A=(6X – 15)°SUDUT B =(4X + 65)°NILAI X =?tolong di bantu

Jawabannya A. 13
6x-15+4x+65 = 180°
6x+4x-15+65 = 180°
6x+4x = (180+15)-65
10x = 195-65
10x = 130
x = 130/10
x = 13