How to do it...

1. Declare the Position data class with x, y, z  properties related to the current position in the Cartesian coordinates system:

data class Position(val x: Float, val y: Float, val z: Float)

2. Add a plus operator implementation for the Position class:

data class Position(val x: Float, val y: Float, val z: Float) {
    operator fun plus(other: Position) = 
      Position(x + other.x, y + other.y, z + other.z)
}

3. Overload the minus operator:

data class Position(val x: Float, val y: Float, val z: Float) {
    operator fun plus(other: Position) = 
      Position(x + other.x, y + other.y, z + other.z)

    operator fun minus(other: Position) = 
      Position(x - other.x, y - other.y, z - other.z)
}