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Simplifying 21x + -3 = 20x + 1 Reorder the terms: -3 + 21x = 20x + 1 Reorder the terms: -3 + 21x = 1 + 20x Solving -3 + 21x = 1 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -3 + 21x + -20x = 1 + 20x + -20x Combine like terms: 21x + -20x = 1x -3 + 1x = 1 + 20x + -20x Combine like terms: 20x + -20x = 0 -3 + 1x = 1 + 0 -3 + 1x = 1 Add '3' to each side of the equation. -3 + 3 + 1x = 1 + 3 Combine like terms: -3 + 3 = 0 0 + 1x = 1 + 3 1x = 1 + 3 Combine like terms: 1 + 3 = 4 1x = 4 Divide each side by '1'. x = 4 Simplifying x = 4
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