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Simplifying (x + 9) + (2x + -21) = 0 Reorder the terms: (9 + x) + (2x + -21) = 0 Remove parenthesis around (9 + x) 9 + x + (2x + -21) = 0 Reorder the terms: 9 + x + (-21 + 2x) = 0 Remove parenthesis around (-21 + 2x) 9 + x + -21 + 2x = 0 Reorder the terms: 9 + -21 + x + 2x = 0 Combine like terms: 9 + -21 = -12 -12 + x + 2x = 0 Combine like terms: x + 2x = 3x -12 + 3x = 0 Solving -12 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 0 + 12 3x = 0 + 12 Combine like terms: 0 + 12 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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