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Simplifying -12 = 6x + -9x + -15 Reorder the terms: -12 = -15 + 6x + -9x Combine like terms: 6x + -9x = -3x -12 = -15 + -3x Solving -12 = -15 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -12 + 3x = -15 + -3x + 3x Combine like terms: -3x + 3x = 0 -12 + 3x = -15 + 0 -12 + 3x = -15 Add '12' to each side of the equation. -12 + 12 + 3x = -15 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = -15 + 12 3x = -15 + 12 Combine like terms: -15 + 12 = -3 3x = -3 Divide each side by '3'. x = -1 Simplifying x = -1
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