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Simplifying 2x + -21 + 9 = x Reorder the terms: -21 + 9 + 2x = x Combine like terms: -21 + 9 = -12 -12 + 2x = x Solving -12 + 2x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -12 + 2x + -1x = x + -1x Combine like terms: 2x + -1x = 1x -12 + 1x = x + -1x Combine like terms: x + -1x = 0 -12 + 1x = 0 Add '12' to each side of the equation. -12 + 12 + 1x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 1x = 0 + 12 1x = 0 + 12 Combine like terms: 0 + 12 = 12 1x = 12 Divide each side by '1'. x = 12 Simplifying x = 12
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