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Simplifying 1x + -1(21 + -1x) = 3 1x + (21 * -1 + -1x * -1) = 3 1x + (-21 + 1x) = 3 Reorder the terms: -21 + 1x + 1x = 3 Combine like terms: 1x + 1x = 2x -21 + 2x = 3 Solving -21 + 2x = 3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2x = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 3 + 21 2x = 3 + 21 Combine like terms: 3 + 21 = 24 2x = 24 Divide each side by '2'. x = 12 Simplifying x = 12
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