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Simplifying x + (x + -1) = 7 Reorder the terms: x + (-1 + x) = 7 Remove parenthesis around (-1 + x) x + -1 + x = 7 Reorder the terms: -1 + x + x = 7 Combine like terms: x + x = 2x -1 + 2x = 7 Solving -1 + 2x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 2x = 7 + 1 Combine like terms: -1 + 1 = 0 0 + 2x = 7 + 1 2x = 7 + 1 Combine like terms: 7 + 1 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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