Write a related subtraction fact for 6+8=14

For the equations below which statement is true ? -2x=14 6x=-42

X– 4 = 12.5 can be written in words as

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image