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Simplifying x + 9 = -1x + 21 Reorder the terms: 9 + x = -1x + 21 Reorder the terms: 9 + x = 21 + -1x Solving 9 + x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 9 + x + x = 21 + -1x + x Combine like terms: x + x = 2x 9 + 2x = 21 + -1x + x Combine like terms: -1x + x = 0 9 + 2x = 21 + 0 9 + 2x = 21 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 = 12 2x = 12 Divide each side by '2'. x = 6 Simplifying x = 6
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