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3 + 9 = 12
-9
12 plus 9 equals 21.
do you mean what is 3+6+9-12? The answer is 6: 3+6=9 9+9=18 18-12=6 :)
12+3(y) 12+ 3(-3) 12 + {3x (-3)} 12+ (-9) 12-9 3