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Simplifying 2x + 1 = 21 + -3x Reorder the terms: 1 + 2x = 21 + -3x Solving 1 + 2x = 21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 1 + 2x + 3x = 21 + -3x + 3x Combine like terms: 2x + 3x = 5x 1 + 5x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 1 + 5x = 21 + 0 1 + 5x = 21 Add '-1' to each side of the equation. 1 + -1 + 5x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 5x = 21 + -1 5x = 21 + -1 Combine like terms: 21 + -1 = 20 5x = 20 Divide each side by '5'. x = 4 Simplifying x = 4
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