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Simplifying x + 2x + (2x + 15) = 100 Reorder the terms: x + 2x + (15 + 2x) = 100 Remove parenthesis around (15 + 2x) x + 2x + 15 + 2x = 100 Reorder the terms: 15 + x + 2x + 2x = 100 Combine like terms: x + 2x = 3x 15 + 3x + 2x = 100 Combine like terms: 3x + 2x = 5x 15 + 5x = 100 Solving 15 + 5x = 100 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 + 5x = 100 + -15 Combine like terms: 15 + -15 = 0 0 + 5x = 100 + -15 5x = 100 + -15 Combine like terms: 100 + -15 = 85 5x = 85 Divide each side by '5'. x = 17 Simplifying x = 17
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