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Simplifying x2 + 5x + 9 = x2 Reorder the terms: 9 + 5x + x2 = x2 Add '-1x2' to each side of the equation. 9 + 5x + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + 5x + 0 = x2 + -1x2 9 + 5x = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + 5x = 0 Solving 9 + 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 5x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 5x = 0 + -9 5x = 0 + -9 Combine like terms: 0 + -9 = -9 5x = -9 Divide each side by '5'. x = -1.8 Simplifying x = -1.8
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