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Simplifying (3a + -1b) + -1[2a + -1(a + b)] = 0 Remove parenthesis around (3a + -1b) 3a + -1b + -1[2a + -1(a + b)] = 0 3a + -1b + -1[2a + (a * -1 + b * -1)] = 0 3a + -1b + -1[2a + (-1a + -1b)] = 0 Combine like terms: 2a + -1a = 1a 3a + -1b + -1[1a + -1b] = 0 3a + -1b + [1a * -1 + -1b * -1] = 0 3a + -1b + [-1a + 1b] = 0 Reorder the terms: 3a + -1a + -1b + 1b = 0 Combine like terms: 3a + -1a = 2a 2a + -1b + 1b = 0 Combine like terms: -1b + 1b = 0 2a + 0 = 0 2a = 0 Solving 2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '2'. a = 0 Simplifying a = 0
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