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Simplifying ((a + 3) + -1(0 + -1b)) + -9 = -20 Reorder the terms: ((3 + a) + -1(0 + -1b)) + -9 = -20 Remove parenthesis around (3 + a) (3 + a + -1(0 + -1b)) + -9 = -20 Remove the zero: (3 + a + -1(-1b)) + -9 = -20 Remove parenthesis around (-1b) (3 + a + -1 * -1b) + -9 = -20 Multiply -1 * -1 (3 + a + 1b) + -9 = -20 Remove parenthesis around (3 + a + 1b) 3 + a + 1b + -9 = -20 Reorder the terms: 3 + -9 + a + 1b = -20 Combine like terms: 3 + -9 = -6 -6 + a + 1b = -20 Solving -6 + a + 1b = -20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + a + 6 + 1b = -20 + 6 Reorder the terms: -6 + 6 + a + 1b = -20 + 6 Combine like terms: -6 + 6 = 0 0 + a + 1b = -20 + 6 a + 1b = -20 + 6 Combine like terms: -20 + 6 = -14 a + 1b = -14 Add '-1b' to each side of the equation. a + 1b + -1b = -14 + -1b Combine like terms: 1b + -1b = 0 a + 0 = -14 + -1b a = -14 + -1b Simplifying a = -14 + -1b
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