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Simplifying x + (2x + -30) = 90 Reorder the terms: x + (-30 + 2x) = 90 Remove parenthesis around (-30 + 2x) x + -30 + 2x = 90 Reorder the terms: -30 + x + 2x = 90 Combine like terms: x + 2x = 3x -30 + 3x = 90 Solving -30 + 3x = 90 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 + 3x = 90 + 30 Combine like terms: -30 + 30 = 0 0 + 3x = 90 + 30 3x = 90 + 30 Combine like terms: 90 + 30 = 120 3x = 120 Divide each side by '3'. x = 40 Simplifying x = 40
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