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