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Simplifying x * x + -9 = x * x + -2x Multiply x * x x2 + -9 = x * x + -2x Reorder the terms: -9 + x2 = x * x + -2x Multiply x * x -9 + x2 = x2 + -2x Reorder the terms: -9 + x2 = -2x + x2 Add '-1x2' to each side of the equation. -9 + x2 + -1x2 = -2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 + 0 = -2x + x2 + -1x2 -9 = -2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 = -2x + 0 -9 = -2x Solving -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. -9 + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 -9 + 2x = 0 Add '9' to each side of the equation. -9 + 9 + 2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 0 + 9 2x = 0 + 9 Combine like terms: 0 + 9 = 9 2x = 9 Divide each side by '2'. x = 4.5 Simplifying x = 4.5
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