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Simplifying x + (2x + -1) = 20 Reorder the terms: x + (-1 + 2x) = 20 Remove parenthesis around (-1 + 2x) x + -1 + 2x = 20 Reorder the terms: -1 + x + 2x = 20 Combine like terms: x + 2x = 3x -1 + 3x = 20 Solving -1 + 3x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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