CLP(R) is a declarative programming language. It stands for Constraint logic programming (Real) where real refers to the real numbers. It can be considered and is generally implemented as a superset or add-on package for a Prolog implementation.
The simultaneous linear equations:
3x + 4y - 2z = 8
x - 5y + z = 10
2x + 3y -z = 20
are expressed in CLP(R) as:
3*X + 4*Y - 2*Z = 8,
X - 5*Y + Z = 10,
2*X + 3*Y -Z = 20.
and a typical implementation's response would be:
Z = 35.75
Y = 8.25
X = 15.5
Yes