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Simplifying x + -1 = 20 + -2x 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 = 3x -1 + 3x = 20 + -2x + 2x Combine like terms: -2x + 2x = 0 -1 + 3x = 20 + 0 -1 + 3x = 20 Add '1' to each side of the equation. -1 + 1 + 3x = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 3x = 20 + 1 3x = 20 + 1 Combine like terms: 20 + 1 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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