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Simplifying x + 2x + (x + 30) = 130 Reorder the terms: x + 2x + (30 + x) = 130 Remove parenthesis around (30 + x) x + 2x + 30 + x = 130 Reorder the terms: 30 + x + 2x + x = 130 Combine like terms: x + 2x = 3x 30 + 3x + x = 130 Combine like terms: 3x + x = 4x 30 + 4x = 130 Solving 30 + 4x = 130 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 + 4x = 130 + -30 Combine like terms: 30 + -30 = 0 0 + 4x = 130 + -30 4x = 130 + -30 Combine like terms: 130 + -30 = 100 4x = 100 Divide each side by '4'. x = 25 Simplifying x = 25
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