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Simplifying 12b + -1(9b + 4a) = 0 Reorder the terms: 12b + -1(4a + 9b) = 0 12b + (4a * -1 + 9b * -1) = 0 12b + (-4a + -9b) = 0 Reorder the terms: -4a + 12b + -9b = 0 Combine like terms: 12b + -9b = 3b -4a + 3b = 0 Solving -4a + 3b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3b' to each side of the equation. -4a + 3b + -3b = 0 + -3b Combine like terms: 3b + -3b = 0 -4a + 0 = 0 + -3b -4a = 0 + -3b Remove the zero: -4a = -3b Divide each side by '-4'. a = 0.75b Simplifying a = 0.75b
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