This equation would be written as 2(n-3)=8.
In any case. if the x values (-6) are the same for both points the equation of line would be x = -6
Sand to cement
7:3
210:x
ask yourself what number is needed to multiply by 7 to get 210 ( so you'd divide 210 by 7 which is 30). Multiply the other side by thirty as well to get the value of x
3*30 which is 90