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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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