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(x+9)^2 =x^2 + 9 X^2 + 18x + 81 = X^2 +9 18X + 72 = 0 18X = -72 X =- 4
t-9=x
(92 x 2) - (9 x 2) = 162 - 18 = 144 The number is therefore 9.
x/4 - (9 - 3) =x/4 - 6
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