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Simplifying 9x + 21x + 12 = 0 Reorder the terms: 12 + 9x + 21x = 0 Combine like terms: 9x + 21x = 30x 12 + 30x = 0 Solving 12 + 30x = 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 + 30x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 30x = 0 + -12 30x = 0 + -12 Combine like terms: 0 + -12 = -12 30x = -12 Divide each side by '30'. x = -0.4 Simplifying x = -0.4
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