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Simplifying x + -1 = 2x + 20 Reorder the terms: -1 + x = 2x + 20 Reorder the terms: -1 + x = 20 + 2x Solving -1 + x = 20 + 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. -1 + x + -2x = 20 + 2x + -2x Combine like terms: x + -2x = -1x -1 + -1x = 20 + 2x + -2x Combine like terms: 2x + -2x = 0 -1 + -1x = 20 + 0 -1 + -1x = 20 Add '1' to each side of the equation. -1 + 1 + -1x = 20 + 1 Combine like terms: -1 + 1 = 0 0 + -1x = 20 + 1 -1x = 20 + 1 Combine like terms: 20 + 1 = 21 -1x = 21 Divide each side by '-1'. x = -21 Simplifying x = -21
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