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Simplifying 9x + 12x + 4 = 0 Reorder the terms: 4 + 9x + 12x = 0 Combine like terms: 9x + 12x = 21x 4 + 21x = 0 Solving 4 + 21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 21x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 21x = 0 + -4 21x = 0 + -4 Combine like terms: 0 + -4 = -4 21x = -4 Divide each side by '21'. x = -0.1904761905 Simplifying x = -0.1904761905
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