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Simplifying 9b(1 + 3a) = 0 (1 * 9b + 3a * 9b) = 0 Reorder the terms: (27ab + 9b) = 0 (27ab + 9b) = 0 Solving 27ab + 9b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9b' to each side of the equation. 27ab + 9b + -9b = 0 + -9b Combine like terms: 9b + -9b = 0 27ab + 0 = 0 + -9b 27ab = 0 + -9b Remove the zero: 27ab = -9b Divide each side by '27b'. a = -0.3333333333 Simplifying a = -0.3333333333
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