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Simplifying x + (x + -20) = 57 Reorder the terms: x + (-20 + x) = 57 Remove parenthesis around (-20 + x) x + -20 + x = 57 Reorder the terms: -20 + x + x = 57 Combine like terms: x + x = 2x -20 + 2x = 57 Solving -20 + 2x = 57 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 2x = 57 + 20 Combine like terms: -20 + 20 = 0 0 + 2x = 57 + 20 2x = 57 + 20 Combine like terms: 57 + 20 = 77 2x = 77 Divide each side by '2'. x = 38.5 Simplifying x = 38.5
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