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Simplifying x + 3x + -1 = 128 Reorder the terms: -1 + x + 3x = 128 Combine like terms: x + 3x = 4x -1 + 4x = 128 Solving -1 + 4x = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 4x = 128 + 1 Combine like terms: -1 + 1 = 0 0 + 4x = 128 + 1 4x = 128 + 1 Combine like terms: 128 + 1 = 129 4x = 129 Divide each side by '4'. x = 32.25 Simplifying x = 32.25
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