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Simplifying -3x + -9 = 12 Reorder the terms: -9 + -3x = 12 Solving -9 + -3x = 12 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 + -3x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + -3x = 12 + 9 -3x = 12 + 9 Combine like terms: 12 + 9 = 21 -3x = 21 Divide each side by '-3'. x = -7 Simplifying x = -7
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