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Simplifying 3x + -4 = 12 + x Reorder the terms: -4 + 3x = 12 + x Solving -4 + 3x = 12 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -4 + 3x + -1x = 12 + x + -1x Combine like terms: 3x + -1x = 2x -4 + 2x = 12 + x + -1x Combine like terms: x + -1x = 0 -4 + 2x = 12 + 0 -4 + 2x = 12 Add '4' to each side of the equation. -4 + 4 + 2x = 12 + 4 Combine like terms: -4 + 4 = 0 0 + 2x = 12 + 4 2x = 12 + 4 Combine like terms: 12 + 4 = 16 2x = 16 Divide each side by '2'. x = 8 Simplifying x = 8
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