Question

Can someone please help me with this​

Answer 1

70+9x+7-21x-5=0
-12x=-72
x=6


Step-by-step explanation:
The three inner angles of the triangle add up to 180. And if a straight line is split into two angles, those also add to 180 degrees. So we can make the equation '9x+7 + 70 + 180-(21x+5) = 180'

Answer 2

The solution is attached up.