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Simplifying 9x + 4b + 12x = 0 Reorder the terms: 4b + 9x + 12x = 0 Combine like terms: 9x + 12x = 21x 4b + 21x = 0 Solving 4b + 21x = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21x' to each side of the equation. 4b + 21x + -21x = 0 + -21x Combine like terms: 21x + -21x = 0 4b + 0 = 0 + -21x 4b = 0 + -21x Remove the zero: 4b = -21x Divide each side by '4'. b = -5.25x Simplifying b = -5.25x
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