6n -3=2n+9 6n-2n=9+3
4n=12
n=12/4
n=3
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2n-9=-4
4n - 2n = 18 Therefore, 2n = 18 Therefore, n = 18/2 = 9
Subtract 2n from each side: 3n - 9 = 6 Add 9 to each side: 3n = 15 Divide both sides by 3: n = 5 Therefore, n = 5
9+9+9+9 = 36
If I am correct, 9 plus 7 equals 112.