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Simplifying (x + 21) + (2x + 9) = 18 Reorder the terms: (21 + x) + (2x + 9) = 18 Remove parenthesis around (21 + x) 21 + x + (2x + 9) = 18 Reorder the terms: 21 + x + (9 + 2x) = 18 Remove parenthesis around (9 + 2x) 21 + x + 9 + 2x = 18 Reorder the terms: 21 + 9 + x + 2x = 18 Combine like terms: 21 + 9 = 30 30 + x + 2x = 18 Combine like terms: x + 2x = 3x 30 + 3x = 18 Solving 30 + 3x = 18 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 = 18 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = 18 + -30 3x = 18 + -30 Combine like terms: 18 + -30 = -12 3x = -12 Divide each side by '3'. x = -4 Simplifying x = -4
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