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Simplifying x + (x + 9) = 30 Reorder the terms: x + (9 + x) = 30 Remove parenthesis around (9 + x) x + 9 + x = 30 Reorder the terms: 9 + x + x = 30 Combine like terms: x + x = 2x 9 + 2x = 30 Solving 9 + 2x = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2x = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 30 + -9 2x = 30 + -9 Combine like terms: 30 + -9 = 21 2x = 21 Divide each side by '2'. x = 10.5 Simplifying x = 10.5
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