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(9x)2 = 81x2
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9 x 9
x^2 +9 =x^2 -9 9=-9 No solution
3 because 3x3=9
x times the sum of x and 9 x times (x times 9) x(9x) 9 times x[squared] 9x[squared]
03 squared = 3 x 3 = 9