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Let the unknown number be x: 9x-15 = 39 9x = 39+15 9x = 54 Divide both sides by 9 to find the value of x: x = 6
9x - 20 = 7 9x = 27 x = 3
ANSWER: -4X2 -8X-4x (x+2)= (-4x * x) + (-4x*2)= -4X2 -8X
9x+7
(9x)2 = 81x2