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Simplifying 21 + 9x = -3x Solving 21 + 9x = -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 9x + 3x = -3x + 3x Combine like terms: 9x + 3x = 12x 21 + 12x = -3x + 3x Combine like terms: -3x + 3x = 0 21 + 12x = 0 Add '-21' to each side of the equation. 21 + -21 + 12x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = 0 + -21 12x = 0 + -21 Combine like terms: 0 + -21 = -21 12x = -21 Divide each side by '12'. x = -1.75 Simplifying x = -1.75
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