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Simplifying 16 = 9x(9x) Remove parenthesis around (9x) 16 = 9x * 9x Reorder the terms for easier multiplication: 16 = 9 * 9x * x Multiply 9 * 9 16 = 81x * x Multiply x * x 16 = 81x2 Solving 16 = 81x2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-81x2' to each side of the equation. 16 + -81x2 = 81x2 + -81x2 Combine like terms: 81x2 + -81x2 = 0 16 + -81x2 = 0 Add '-16' to each side of the equation. 16 + -16 + -81x2 = 0 + -16 Combine like terms: 16 + -16 = 0 0 + -81x2 = 0 + -16 -81x2 = 0 + -16 Combine like terms: 0 + -16 = -16 -81x2 = -16 Divide each side by '-81'. x2 = 0.1975308642 Simplifying x2 = 0.1975308642 Take the square root of each side: x = {-0.444444444, 0.444444444}
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