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Simplifying (2x + -1) * 2 = 81 Reorder the terms: (-1 + 2x) * 2 = 81 Reorder the terms for easier multiplication: 2(-1 + 2x) = 81 (-1 * 2 + 2x * 2) = 81 (-2 + 4x) = 81 Solving -2 + 4x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 4x = 81 + 2 Combine like terms: -2 + 2 = 0 0 + 4x = 81 + 2 4x = 81 + 2 Combine like terms: 81 + 2 = 83 4x = 83 Divide each side by '4'. x = 20.75 Simplifying x = 20.75
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