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Simplifying 12x + 9x + -9 = 180 Reorder the terms: -9 + 12x + 9x = 180 Combine like terms: 12x + 9x = 21x -9 + 21x = 180 Solving -9 + 21x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 21x = 180 + 9 Combine like terms: -9 + 9 = 0 0 + 21x = 180 + 9 21x = 180 + 9 Combine like terms: 180 + 9 = 189 21x = 189 Divide each side by '21'. x = 9 Simplifying x = 9
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