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Simplifying (x + 1) + (x + -1) = 7 Reorder the terms: (1 + x) + (x + -1) = 7 Remove parenthesis around (1 + x) 1 + x + (x + -1) = 7 Reorder the terms: 1 + x + (-1 + x) = 7 Remove parenthesis around (-1 + x) 1 + x + -1 + x = 7 Reorder the terms: 1 + -1 + x + x = 7 Combine like terms: 1 + -1 = 0 0 + x + x = 7 x + x = 7 Combine like terms: x + x = 2x 2x = 7 Solving 2x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '2'. x = 3.5 Simplifying x = 3.5
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