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Simplifying 7a + 9b + -9a + 4b = 0 Reorder the terms: 7a + -9a + 9b + 4b = 0 Combine like terms: 7a + -9a = -2a -2a + 9b + 4b = 0 Combine like terms: 9b + 4b = 13b -2a + 13b = 0 Solving -2a + 13b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13b' to each side of the equation. -2a + 13b + -13b = 0 + -13b Combine like terms: 13b + -13b = 0 -2a + 0 = 0 + -13b -2a = 0 + -13b Remove the zero: -2a = -13b Divide each side by '-2'. a = 6.5b Simplifying a = 6.5b
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