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syntactic unit > symbol > operator > assignment operator > augmented assignment operator > -=
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-= comparison table
Subject have example have equivalent is a kind of is an instance of
augmented assignment operator  assignment operator 
-=
example expressionequivalent longer expression
a-=b;a=a-b;
op1 -= op2
is equivalent to
op1 = op1 - op2
 augmented assignment operator

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