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Simplifying x + (x + -50) = 90 Reorder the terms: x + (-50 + x) = 90 Remove parenthesis around (-50 + x) x + -50 + x = 90 Reorder the terms: -50 + x + x = 90 Combine like terms: x + x = 2x -50 + 2x = 90 Solving -50 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + 2x = 90 + 50 Combine like terms: -50 + 50 = 0 0 + 2x = 90 + 50 2x = 90 + 50 Combine like terms: 90 + 50 = 140 2x = 140 Divide each side by '2'. x = 70 Simplifying x = 70
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