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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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