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Simplifying x(x + 3) = x2 + 9 Reorder the terms: x(3 + x) = x2 + 9 (3 * x + x * x) = x2 + 9 (3x + x2) = x2 + 9 Reorder the terms: 3x + x2 = 9 + x2 Add '-1x2' to each side of the equation. 3x + x2 + -1x2 = 9 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x + 0 = 9 + x2 + -1x2 3x = 9 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x = 9 + 0 3x = 9 Solving 3x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '3'. x = 3 Simplifying x = 3
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