Answer:
153/20
Step-by-step explanation:
I assume you're asking
So
=
I tried my best with 1, 2, and 3
A line adds up to equal 180 degrees. And adjacent angles also add to equal 180 since they share a side on a line. So add them together and make them equal 180
9x - 7 + 8.5x + 4 = 180
17.5x - 3 = 180
17.5x = 183
x = 10.5
14 i hope this is what you were looking for