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Simplifying 2x + 21 + 9 = x + 21 Reorder the terms: 21 + 9 + 2x = x + 21 Combine like terms: 21 + 9 = 30 30 + 2x = x + 21 Reorder the terms: 30 + 2x = 21 + x Solving 30 + 2x = 21 + 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. 30 + 2x + -1x = 21 + x + -1x Combine like terms: 2x + -1x = 1x 30 + 1x = 21 + x + -1x Combine like terms: x + -1x = 0 30 + 1x = 21 + 0 30 + 1x = 21 Add '-30' to each side of the equation. 30 + -30 + 1x = 21 + -30 Combine like terms: 30 + -30 = 0 0 + 1x = 21 + -30 1x = 21 + -30 Combine like terms: 21 + -30 = -9 1x = -9 Divide each side by '1'. x = -9 Simplifying x = -9
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