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Simplifying x + 2x + -3 = 18 Reorder the terms: -3 + x + 2x = 18 Combine like terms: x + 2x = 3x -3 + 3x = 18 Solving -3 + 3x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3x = 18 + 3 Combine like terms: -3 + 3 = 0 0 + 3x = 18 + 3 3x = 18 + 3 Combine like terms: 18 + 3 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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