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Simplifying (9a + 9) + -1(7a + -3) = 0 Reorder the terms: (9 + 9a) + -1(7a + -3) = 0 Remove parenthesis around (9 + 9a) 9 + 9a + -1(7a + -3) = 0 Reorder the terms: 9 + 9a + -1(-3 + 7a) = 0 9 + 9a + (-3 * -1 + 7a * -1) = 0 9 + 9a + (3 + -7a) = 0 Reorder the terms: 9 + 3 + 9a + -7a = 0 Combine like terms: 9 + 3 = 12 12 + 9a + -7a = 0 Combine like terms: 9a + -7a = 2a 12 + 2a = 0 Solving 12 + 2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2a = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 2a = 0 + -12 2a = 0 + -12 Combine like terms: 0 + -12 = -12 2a = -12 Divide each side by '2'. a = -6 Simplifying a = -6
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