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Simplifying 8b + 7a + -4b + -9a = 0 Reorder the terms: 7a + -9a + 8b + -4b = 0 Combine like terms: 7a + -9a = -2a -2a + 8b + -4b = 0 Combine like terms: 8b + -4b = 4b -2a + 4b = 0 Solving -2a + 4b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4b' to each side of the equation. -2a + 4b + -4b = 0 + -4b Combine like terms: 4b + -4b = 0 -2a + 0 = 0 + -4b -2a = 0 + -4b Remove the zero: -2a = -4b Divide each side by '-2'. a = 2b Simplifying a = 2b
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