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Simplifying x + (x + -3) = 21 Reorder the terms: x + (-3 + x) = 21 Remove parenthesis around (-3 + x) x + -3 + x = 21 Reorder the terms: -3 + x + x = 21 Combine like terms: x + x = 2x -3 + 2x = 21 Solving -3 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 2x = 21 + 3 2x = 21 + 3 Combine like terms: 21 + 3 = 24 2x = 24 Divide each side by '2'. x = 12 Simplifying x = 12
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