Example of how to overload operators with classes in PowerShell.

NumberClass.ps1

class Number {
    [int] $value = 0

    Number() {
       #Does nothing.
    }

    Number([int]$somethingElse) {
        $this.value = $somethingElse
    }

    [void] SetValue([int]$newValue) {
        $this.value = $newValue
    }

    [int] GetValue() {
        return $this.value
    }

	[boolean] Equals($otherNumber) {
		if($this.value -eq $otherNumber.GetValue()) {
			return $true
		} else {
			return $false
		}
	}

  static [Number] op_Addition([Number]$first, [Number]$second) {
    return [Number]::new($first.GetValue() + $second.GetValue())
  }

  static [Number] op_Subtraction([Number]$first, [Number]$second) {
    return [Number]::new($first.GetValue() - $second.GetValue())
  }

  static [Number] op_Multiply([Number]$first, [Number]$second) {
    return [Number]::new($first.GetValue() * $second.GetValue())
  }

  static [Number] op_Division([Number]$first, [Number]$second) {
    return [Number]::new($first.GetValue() / $second.GetValue())
  }
}

#Main code.
$firstNumber = [Number]::new(8)
$secondNumber = [Number]::new(12)
$thirdNumber = [Number]::new(8)

if($firstNumber -eq $secondNumber) {
	Write-Output "First and second are equal!"
} else {
	Write-Output "First and second are different!"
}

if($firstNumber -eq $thirdNumber) {
	Write-Output "First and third are equal!"
} else {
	Write-Output "First and third are different!"
}

$fourthNumber = $firstNumber + $secondNumber
Write-Output $fourthNumber.GetValue()

$fifthNumber = $secondNumber - $thirdNumber
Write-Output $fifthNumber.GetValue()

$sixthNumber = $firstNumber * $secondNumber
Write-Output $sixthNumber.GetValue()

$seventhNumber = $sixthNumber / $firstNumber
Write-Output $seventhNumber.GetValue()