The answer is x=15
First figure out the angle: the angle is supplementary which equals to a total of 180 degrees. So in order to find x we must add 7x+60 and 15 and equal it to 180 degrees.
7x+60+15=180
Then you will add like terms on both sides which is 60 and 15 which gets you 75.
7x+75=180
Then you need to get x alone so you will subtract 75 on both sides.
7x+75= 180
-75 -75
———————
7x=105
Then you divide both sides by 7 so you can get x by it self.
7x=105
—-=——
7 7
This will give you x = 15.
Now that you have what x is you need to find the missing angle. You will do this by plugging in x=15 into 7x+60
7(15)+60
105+60= 165
To check you work you can add up both angles to see if you will get 180 as you total if u do it’s correct.
165+15=180