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Simplifying 2(2x + -1) = 21 Reorder the terms: 2(-1 + 2x) = 21 (-1 * 2 + 2x * 2) = 21 (-2 + 4x) = 21 Solving -2 + 4x = 21 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 = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 4x = 21 + 2 4x = 21 + 2 Combine like terms: 21 + 2 = 23 4x = 23 Divide each side by '4'. x = 5.75 Simplifying x = 5.75
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