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Simplifying 12 + -4x = -3x + 9 Reorder the terms: 12 + -4x = 9 + -3x Solving 12 + -4x = 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 + -4x + 3x = 9 + -3x + 3x Combine like terms: -4x + 3x = -1x 12 + -1x = 9 + -3x + 3x Combine like terms: -3x + 3x = 0 12 + -1x = 9 + 0 12 + -1x = 9 Add '-12' to each side of the equation. 12 + -12 + -1x = 9 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 9 + -12 -1x = 9 + -12 Combine like terms: 9 + -12 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3
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