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