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Simplifying -9x + 11x + -21 = 21 Reorder the terms: -21 + -9x + 11x = 21 Combine like terms: -9x + 11x = 2x -21 + 2x = 21 Solving -21 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 21 + 21 2x = 21 + 21 Combine like terms: 21 + 21 = 42 2x = 42 Divide each side by '2'. x = 21 Simplifying x = 21
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