Answer:
x-60
Explanation:
Well the expressions lie on a straight line so I know that both of the added together will equal 180.
So the equation looks like this-(x-1+2x+1=180)
So when I substitute 60 in the equation it looks like this-(60-1+2(60)+1=180)
To solve-60-1+120+1::59+120+1::60+120
180