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Simplifying 7b + 4a + -6a + -9b = 0 Reorder the terms: 4a + -6a + 7b + -9b = 0 Combine like terms: 4a + -6a = -2a -2a + 7b + -9b = 0 Combine like terms: 7b + -9b = -2b -2a + -2b = 0 Solving -2a + -2b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2b' to each side of the equation. -2a + -2b + 2b = 0 + 2b Combine like terms: -2b + 2b = 0 -2a + 0 = 0 + 2b -2a = 0 + 2b Remove the zero: -2a = 2b Divide each side by '-2'. a = -1b Simplifying a = -1b
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