RB assignment operator shortcuts?

[Jeff Alberti]

Is there a short cut in RB to do something similar to the following,  
I have always wondered. I was hoping to stumble across the answer  
shortly after using RB, but the shortly part has turned into many years:

$count = $count + 1
SHORTCUT: $count += 1

$count = $count -1
SHORTCUT: $count -= 1

or

$string = $string + "Add text"
SHORTCUT: $string += "Add text"

Thanks

Jeff
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