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Simplifying x + (x + -63) = 687 Reorder the terms: x + (-63 + x) = 687 Remove parenthesis around (-63 + x) x + -63 + x = 687 Reorder the terms: -63 + x + x = 687 Combine like terms: x + x = 2x -63 + 2x = 687 Solving -63 + 2x = 687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 2x = 687 + 63 Combine like terms: -63 + 63 = 0 0 + 2x = 687 + 63 2x = 687 + 63 Combine like terms: 687 + 63 = 750 2x = 750 Divide each side by '2'. x = 375 Simplifying x = 375
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