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Simplifying (3x + 15) + (9x + -2) = 0 Reorder the terms: (15 + 3x) + (9x + -2) = 0 Remove parenthesis around (15 + 3x) 15 + 3x + (9x + -2) = 0 Reorder the terms: 15 + 3x + (-2 + 9x) = 0 Remove parenthesis around (-2 + 9x) 15 + 3x + -2 + 9x = 0 Reorder the terms: 15 + -2 + 3x + 9x = 0 Combine like terms: 15 + -2 = 13 13 + 3x + 9x = 0 Combine like terms: 3x + 9x = 12x 13 + 12x = 0 Solving 13 + 12x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 12x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 12x = 0 + -13 12x = 0 + -13 Combine like terms: 0 + -13 = -13 12x = -13 Divide each side by '12'. x = -1.083333333 Simplifying x = -1.083333333
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