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Simplifying 12x + -126 = 54 + -3x Reorder the terms: -126 + 12x = 54 + -3x Solving -126 + 12x = 54 + -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. -126 + 12x + 3x = 54 + -3x + 3x Combine like terms: 12x + 3x = 15x -126 + 15x = 54 + -3x + 3x Combine like terms: -3x + 3x = 0 -126 + 15x = 54 + 0 -126 + 15x = 54 Add '126' to each side of the equation. -126 + 126 + 15x = 54 + 126 Combine like terms: -126 + 126 = 0 0 + 15x = 54 + 126 15x = 54 + 126 Combine like terms: 54 + 126 = 180 15x = 180 Divide each side by '15'. x = 12 Simplifying x = 12
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