This is an example of the Commutative Property of Addition. You can change the order of the addends (the numbers being added up) and the sum stays the same, 6+3=9, 3+6=9.
To remember what the Commutative Property does, think of commute, like somebody commuting to work (move from one place to another)
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-3
5050
Which is equal to 46 59-3 plus 6.2 or 4 plus 8 plus 2.5 or 412 plus 3-4 or 73 plus 3 plus 7 or 210 plus 5 plus 6?
2/3 + 4/6 = 4/3 or 11/3
Negative 12 minus 3 plus 9 is equal to -6