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Simplifying x + 21 + 2x = -9 + -2x + -15 Reorder the terms: 21 + x + 2x = -9 + -2x + -15 Combine like terms: x + 2x = 3x 21 + 3x = -9 + -2x + -15 Reorder the terms: 21 + 3x = -9 + -15 + -2x Combine like terms: -9 + -15 = -24 21 + 3x = -24 + -2x Solving 21 + 3x = -24 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + 3x + 2x = -24 + -2x + 2x Combine like terms: 3x + 2x = 5x 21 + 5x = -24 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 5x = -24 + 0 21 + 5x = -24 Add '-21' to each side of the equation. 21 + -21 + 5x = -24 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = -24 + -21 5x = -24 + -21 Combine like terms: -24 + -21 = -45 5x = -45 Divide each side by '5'. x = -9 Simplifying x = -9
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