Can someone help? i have a test tomorrow and im really confused with this

(3x+6) +(x+2)=180 Reason:angles on a straight line =180(degrees)

3x+6+x+2=180
(what I did in this strep was to remove the brackets so I times sign(+) into the bracket. So if it was a minus,then (3x+6)-(x+2)=180 so when I remove the brackets to get a normal equation then it will be written like 3x+6-x-6=180. You multiply the negative into the brackets. So remember +x+=+ (gives you a positive) and -x-=+ and a -x+=- (the x is times, a multiplication sign) remember that rule for multiplying signs)

3x+6+x+2=180
3x+x+6+2=180
4x+8=180
4x+8-8=180-8 (8-8=0 so they cancel each other out ,take the positive 8 to the other side since we want x to be alone, when you take the 8 to the other side of the equal sign, it becomes a negative 8, the sign has to change when taken to the other side of the equal side

4x=180-8
4x=172
x=43
(What I did is divide 4x by 4 and 172 divided by 4, the reason I did this was because I wanted x on its own. And when you divide you need to divide on both sides)

So after this your substitute the answer we got for x into x. 3(43)+6+43+2=180
135+45=180(degrees)

Hope this makes sense. I explained everything in detail so you can use it for other equations similar to this.

Please mark as brainliest(crown) above my comment

Idon’t know this and this isn’t middle school work