Remark All vertical lines are of the form x = a. The y value only places where the point is on the grid.
For this particular question the x value of the point is where the vertical line is. At x = -2 draw a vertical line. The graph shows what this looks like.
First, we need to get the variable by it self. -2x+6=20 -6=-6 -2x=14 Next, since the operation is multiplication, we need to divided both sides by -2. X=-7