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Simplifying x + (x + -20) = 78 Reorder the terms: x + (-20 + x) = 78 Remove parenthesis around (-20 + x) x + -20 + x = 78 Reorder the terms: -20 + x + x = 78 Combine like terms: x + x = 2x -20 + 2x = 78 Solving -20 + 2x = 78 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 = 78 + 20 Combine like terms: -20 + 20 = 0 0 + 2x = 78 + 20 2x = 78 + 20 Combine like terms: 78 + 20 = 98 2x = 98 Divide each side by '2'. x = 49 Simplifying x = 49
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