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Simplifying (7a + 9b + 8) + (a + -1b + 1) = 0 Reorder the terms: (8 + 7a + 9b) + (a + -1b + 1) = 0 Remove parenthesis around (8 + 7a + 9b) 8 + 7a + 9b + (a + -1b + 1) = 0 Reorder the terms: 8 + 7a + 9b + (1 + a + -1b) = 0 Remove parenthesis around (1 + a + -1b) 8 + 7a + 9b + 1 + a + -1b = 0 Reorder the terms: 8 + 1 + 7a + a + 9b + -1b = 0 Combine like terms: 8 + 1 = 9 9 + 7a + a + 9b + -1b = 0 Combine like terms: 7a + a = 8a 9 + 8a + 9b + -1b = 0 Combine like terms: 9b + -1b = 8b 9 + 8a + 8b = 0 Solving 9 + 8a + 8b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 8a + -9 + 8b = 0 + -9 Reorder the terms: 9 + -9 + 8a + 8b = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 8a + 8b = 0 + -9 8a + 8b = 0 + -9 Combine like terms: 0 + -9 = -9 8a + 8b = -9 Add '-8b' to each side of the equation. 8a + 8b + -8b = -9 + -8b Combine like terms: 8b + -8b = 0 8a + 0 = -9 + -8b 8a = -9 + -8b Divide each side by '8'. a = -1.125 + -1b Simplifying a = -1.125 + -1b
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