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Simplifying x + 3x + -12 = 640 Reorder the terms: -12 + x + 3x = 640 Combine like terms: x + 3x = 4x -12 + 4x = 640 Solving -12 + 4x = 640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 4x = 640 + 12 Combine like terms: -12 + 12 = 0 0 + 4x = 640 + 12 4x = 640 + 12 Combine like terms: 640 + 12 = 652 4x = 652 Divide each side by '4'. x = 163 Simplifying x = 163
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