Hope this helps (sorry if u cant see that)
- given
- distributive property (we distributed the 3)
- sum like terms (we summed 28 and 6)
- addition property of order (we summed 3x to both sides)
- subtraction property of order (we subtracted 10 to both sides)
- division property of order (we divided both sides by 8)
So because this is a vertical line, its going to have all x-coordinates on that line to be the same. In this case, the common x-coordinate is 4, therefore the line is going to be x = 4.