2 x 20 = 40
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sum - means addition less - means subtraction twice - means multiply by 2
X = number. 4X + 9 = 2X - 15 ===========
2x - 4 = 6x -4 = 4x x = -1
Let the unknown number be x: x-4 = 2x -4 = 2x-x -4 = x So the number is -4
2n - 2