Step-by-step explanation:
65 + (y + 9) = 180 ---------- Sum of angles on a
straight line
y + 65 + 9 = 180
y + 74 = 180
y = 180 - 74 = 106
6x + 7 = y + 9 ----------- Alternate angles
But y = 106,
6x + 7 = 106 + 9
6x = 115 - 7
x = 108/6 = 18
