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Simplifying x + (x + -30) = 210 Reorder the terms: x + (-30 + x) = 210 Remove parenthesis around (-30 + x) x + -30 + x = 210 Reorder the terms: -30 + x + x = 210 Combine like terms: x + x = 2x -30 + 2x = 210 Solving -30 + 2x = 210 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 2x = 210 + 30 Combine like terms: -30 + 30 = 0 0 + 2x = 210 + 30 2x = 210 + 30 Combine like terms: 210 + 30 = 240 2x = 240 Divide each side by '2'. x = 120 Simplifying x = 120
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