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Simplifying x2 = x2 + 2x + -9 Reorder the terms: x2 = -9 + 2x + x2 Add '-1x2' to each side of the equation. x2 + -1x2 = -9 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = -9 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = -9 + 2x + 0 0 = -9 + 2x Solving 0 = -9 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 0 + -2x = -9 + 2x + -2x Remove the zero: -2x = -9 + 2x + -2x Combine like terms: 2x + -2x = 0 -2x = -9 + 0 -2x = -9 Divide each side by '-2'. x = 4.5 Simplifying x = 4.5
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