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Simplifying 2x + x + (x + -1) = 15 Reorder the terms: 2x + x + (-1 + x) = 15 Remove parenthesis around (-1 + x) 2x + x + -1 + x = 15 Reorder the terms: -1 + 2x + x + x = 15 Combine like terms: 2x + x = 3x -1 + 3x + x = 15 Combine like terms: 3x + x = 4x -1 + 4x = 15 Solving -1 + 4x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 4x = 15 + 1 Combine like terms: -1 + 1 = 0 0 + 4x = 15 + 1 4x = 15 + 1 Combine like terms: 15 + 1 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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