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Simplifying -12 = x + 9 + -4x Reorder the terms: -12 = 9 + x + -4x Combine like terms: x + -4x = -3x -12 = 9 + -3x Solving -12 = 9 + -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 = 9 + -3x + 3x Combine like terms: -3x + 3x = 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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