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Simplifying x + (x + -4) = 21 Reorder the terms: x + (-4 + x) = 21 Remove parenthesis around (-4 + x) x + -4 + x = 21 Reorder the terms: -4 + x + x = 21 Combine like terms: x + x = 2x -4 + 2x = 21 Solving -4 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 2x = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 2x = 21 + 4 2x = 21 + 4 Combine like terms: 21 + 4 = 25 2x = 25 Divide each side by '2'. x = 12.5 Simplifying x = 12.5
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