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Simplifying x + (x + -80) = 640 Reorder the terms: x + (-80 + x) = 640 Remove parenthesis around (-80 + x) x + -80 + x = 640 Reorder the terms: -80 + x + x = 640 Combine like terms: x + x = 2x -80 + 2x = 640 Solving -80 + 2x = 640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '80' to each side of the equation. -80 + 80 + 2x = 640 + 80 Combine like terms: -80 + 80 = 0 0 + 2x = 640 + 80 2x = 640 + 80 Combine like terms: 640 + 80 = 720 2x = 720 Divide each side by '2'. x = 360 Simplifying x = 360
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