The right member of an equation : right droit rhs

right or rhs takes as argument an quation or an interval.
right or rhs returns the right member of this equation or the right bound of this interval.
Input :

right(2x-1=3)

Or :

rhs(2x-1=3)

Output :

3

Input :

right(1..3)

Or :

rhs(1..3)

Output :

3