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Simplifying -9x + -15 + 12x = 21 Reorder the terms: -15 + -9x + 12x = 21 Combine like terms: -9x + 12x = 3x -15 + 3x = 21 Solving -15 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 21 + 15 3x = 21 + 15 Combine like terms: 21 + 15 = 36 3x = 36 Divide each side by '3'. x = 12 Simplifying x = 12
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