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Simplifying (2x + 15) + (x + -30) = 123 Reorder the terms: (15 + 2x) + (x + -30) = 123 Remove parenthesis around (15 + 2x) 15 + 2x + (x + -30) = 123 Reorder the terms: 15 + 2x + (-30 + x) = 123 Remove parenthesis around (-30 + x) 15 + 2x + -30 + x = 123 Reorder the terms: 15 + -30 + 2x + x = 123 Combine like terms: 15 + -30 = -15 -15 + 2x + x = 123 Combine like terms: 2x + x = 3x -15 + 3x = 123 Solving -15 + 3x = 123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3x = 123 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 123 + 15 3x = 123 + 15 Combine like terms: 123 + 15 = 138 3x = 138 Divide each side by '3'. x = 46 Simplifying x = 46
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