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Simplifying a + [b + -1(a + -1b)] = 0 a + [b + (a * -1 + -1b * -1)] = 0 a + [b + (-1a + 1b)] = 0 Reorder the terms: a + [-1a + b + 1b] = 0 Combine like terms: b + 1b = 2b a + [-1a + 2b] = 0 Remove brackets around [-1a + 2b] a + -1a + 2b = 0 Combine like terms: a + -1a = 0 0 + 2b = 0 2b = 0 Solving 2b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Divide each side by '2'. b = 0 Simplifying b = 0
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