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Simplifying 9a + -1(a + 3b) + 7a = 0 9a + (a * -1 + 3b * -1) + 7a = 0 9a + (-1a + -3b) + 7a = 0 Reorder the terms: 9a + -1a + 7a + -3b = 0 Combine like terms: 9a + -1a = 8a 8a + 7a + -3b = 0 Combine like terms: 8a + 7a = 15a 15a + -3b = 0 Solving 15a + -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. 15a + -3b + 3b = 0 + 3b Combine like terms: -3b + 3b = 0 15a + 0 = 0 + 3b 15a = 0 + 3b Remove the zero: 15a = 3b Divide each side by '15'. a = 0.2b Simplifying a = 0.2b
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