Let x be an variable.
\Find the point that is the same distance from
2 and 4 i.e. mid point between
2 and 4.
Mid point "M" = 
Mid point between
2 and 4 is 1.
The distance from
2 to 1 is 3 units.
The distance from 1 to 4 is 3 units.
\So the equation is
.
Graph of the equation on a number line.
\
The equation is
.