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Simplifying 21x + 9 = 9x + -99 Reorder the terms: 9 + 21x = 9x + -99 Reorder the terms: 9 + 21x = -99 + 9x Solving 9 + 21x = -99 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 9 + 21x + -9x = -99 + 9x + -9x Combine like terms: 21x + -9x = 12x 9 + 12x = -99 + 9x + -9x Combine like terms: 9x + -9x = 0 9 + 12x = -99 + 0 9 + 12x = -99 Add '-9' to each side of the equation. 9 + -9 + 12x = -99 + -9 Combine like terms: 9 + -9 = 0 0 + 12x = -99 + -9 12x = -99 + -9 Combine like terms: -99 + -9 = -108 12x = -108 Divide each side by '12'. x = -9 Simplifying x = -9
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