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Simplifying x + (640 + x) = 1860 Remove parenthesis around (640 + x) x + 640 + x = 1860 Reorder the terms: 640 + x + x = 1860 Combine like terms: x + x = 2x 640 + 2x = 1860 Solving 640 + 2x = 1860 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-640' to each side of the equation. 640 + -640 + 2x = 1860 + -640 Combine like terms: 640 + -640 = 0 0 + 2x = 1860 + -640 2x = 1860 + -640 Combine like terms: 1860 + -640 = 1220 2x = 1220 Divide each side by '2'. x = 610 Simplifying x = 610
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