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Simplifying -9(7a + -9b) = 0 (7a * -9 + -9b * -9) = 0 (-63a + 81b) = 0 Solving -63a + 81b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-81b' to each side of the equation. -63a + 81b + -81b = 0 + -81b Combine like terms: 81b + -81b = 0 -63a + 0 = 0 + -81b -63a = 0 + -81b Remove the zero: -63a = -81b Divide each side by '-63'. a = 1.285714286b Simplifying a = 1.285714286b
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