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Simplifying 2x + 7x + -9 = 18 Reorder the terms: -9 + 2x + 7x = 18 Combine like terms: 2x + 7x = 9x -9 + 9x = 18 Solving -9 + 9x = 18 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 + 9x = 18 + 9 Combine like terms: -9 + 9 = 0 0 + 9x = 18 + 9 9x = 18 + 9 Combine like terms: 18 + 9 = 27 9x = 27 Divide each side by '9'. x = 3 Simplifying x = 3
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