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syntactic unit > symbol > operator > assignment operator > augmented assignment operator > -=

-=
subject			fact

-=	has example example expression equivalent longer expression a-=b; a=a-b;
	has equivalent op1 -= op2 is equivalent to op1 = op1 - op2
	is a subtopic of Operators
	is an instance of augmented assignment operator
augmented assignment operator	has syntax variable name operator= expression
	may cause an expression written using it to execute faster than the corresponding expression written without it
	reassigns a variable to a value obtained through a combination of the variable's current value with an expression's value
operator	evaluates to its result
	has precedence
	has purpose to perform a simple function of 1 to 3 arguments
	is part of an expression
	is evaluated before another operator with lower precedence
	returns a value called its result
syntactic unit	has syntax rule bold = mandatory italic = non-terminal normal font = optional