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Simplifying 3x + 6x + -12 = 15 Reorder the terms: -12 + 3x + 6x = 15 Combine like terms: 3x + 6x = 9x -12 + 9x = 15 Solving -12 + 9x = 15 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 + 9x = 15 + 12 Combine like terms: -12 + 12 = 0 0 + 9x = 15 + 12 9x = 15 + 12 Combine like terms: 15 + 12 = 27 9x = 27 Divide each side by '9'. x = 3 Simplifying x = 3
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