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Simplifying 2(x + 1) + 3x = 21 Reorder the terms: 2(1 + x) + 3x = 21 (1 * 2 + x * 2) + 3x = 21 (2 + 2x) + 3x = 21 Combine like terms: 2x + 3x = 5x 2 + 5x = 21 Solving 2 + 5x = 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 + 5x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + 5x = 21 + -2 5x = 21 + -2 Combine like terms: 21 + -2 = 19 5x = 19 Divide each side by '5'. x = 3.8 Simplifying x = 3.8
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