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Simplifying -1x + -12 = 2x + 9 Reorder the terms: -12 + -1x = 2x + 9 Reorder the terms: -12 + -1x = 9 + 2x Solving -12 + -1x = 9 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -12 + -1x + -2x = 9 + 2x + -2x Combine like terms: -1x + -2x = -3x -12 + -3x = 9 + 2x + -2x Combine like terms: 2x + -2x = 0 -12 + -3x = 9 + 0 -12 + -3x = 9 Add '12' to each side of the equation. -12 + 12 + -3x = 9 + 12 Combine like terms: -12 + 12 = 0 0 + -3x = 9 + 12 -3x = 9 + 12 Combine like terms: 9 + 12 = 21 -3x = 21 Divide each side by '-3'. x = -7 Simplifying x = -7
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