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Simplifying x + 2x + -12 = 42 Reorder the terms: -12 + x + 2x = 42 Combine like terms: x + 2x = 3x -12 + 3x = 42 Solving -12 + 3x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3x = 42 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 42 + 12 3x = 42 + 12 Combine like terms: 42 + 12 = 54 3x = 54 Divide each side by '3'. x = 18 Simplifying x = 18
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