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Simplifying x + (15 + x) + (-39 + 2x) = 644 Remove parenthesis around (15 + x) x + 15 + x + (-39 + 2x) = 644 Remove parenthesis around (-39 + 2x) x + 15 + x + -39 + 2x = 644 Reorder the terms: 15 + -39 + x + x + 2x = 644 Combine like terms: 15 + -39 = -24 -24 + x + x + 2x = 644 Combine like terms: x + x = 2x -24 + 2x + 2x = 644 Combine like terms: 2x + 2x = 4x -24 + 4x = 644 Solving -24 + 4x = 644 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + 4x = 644 + 24 Combine like terms: -24 + 24 = 0 0 + 4x = 644 + 24 4x = 644 + 24 Combine like terms: 644 + 24 = 668 4x = 668 Divide each side by '4'. x = 167 Simplifying x = 167
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