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Simplifying 9x + 3x + -18 = 99 Reorder the terms: -18 + 9x + 3x = 99 Combine like terms: 9x + 3x = 12x -18 + 12x = 99 Solving -18 + 12x = 99 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 12x = 99 + 18 Combine like terms: -18 + 18 = 0 0 + 12x = 99 + 18 12x = 99 + 18 Combine like terms: 99 + 18 = 117 12x = 117 Divide each side by '12'. x = 9.75 Simplifying x = 9.75
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