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Simplifying 1x + 21 = 3 Reorder the terms: 21 + 1x = 3 Solving 21 + 1x = 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 + 1x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 3 + -21 1x = 3 + -21 Combine like terms: 3 + -21 = -18 1x = -18 Divide each side by '1'. x = -18 Simplifying x = -18

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