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Simplifying x + (x + -9) = 21 Reorder the terms: x + (-9 + x) = 21 Remove parenthesis around (-9 + x) x + -9 + x = 21 Reorder the terms: -9 + x + x = 21 Combine like terms: x + x = 2x -9 + 2x = 21 Solving -9 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 2x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 21 + 9 2x = 21 + 9 Combine like terms: 21 + 9 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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