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Simplifying x + (x + -5) = 21 Reorder the terms: x + (-5 + x) = 21 Remove parenthesis around (-5 + x) x + -5 + x = 21 Reorder the terms: -5 + x + x = 21 Combine like terms: x + x = 2x -5 + 2x = 21 Solving -5 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 2x = 21 + 5 Combine like terms: -5 + 5 = 0 0 + 2x = 21 + 5 2x = 21 + 5 Combine like terms: 21 + 5 = 26 2x = 26 Divide each side by '2'. x = 13 Simplifying x = 13
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