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Simplifying x + 2x + 15 = 20 + 1 Reorder the terms: 15 + x + 2x = 20 + 1 Combine like terms: x + 2x = 3x 15 + 3x = 20 + 1 Combine like terms: 20 + 1 = 21 15 + 3x = 21 Solving 15 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 21 + -15 3x = 21 + -15 Combine like terms: 21 + -15 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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