Groovy minus equals

MinusEquals.groovy

def vals = [50, 25, 5, 0, -5, -25, 50]

vals.each{
    println "\n\nVal is $it"

    int i = 50
    i =- it
    println "(50 =- $it) is equal to $i"
    
    i = 50
    i -= it
    println "(50 -= $it) is equal to $i"
}