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Simplifying (A + -1b) + b + b + (a + -1b) + a + a = 0 Remove parenthesis around (A + -1b) A + -1b + b + b + (a + -1b) + a + a = 0 Remove parenthesis around (a + -1b) A + -1b + b + b + a + -1b + a + a = 0 Reorder the terms: A + a + a + a + -1b + b + b + -1b = 0 Combine like terms: a + a = 2a A + 2a + a + -1b + b + b + -1b = 0 Combine like terms: 2a + a = 3a A + 3a + -1b + b + b + -1b = 0 Combine like terms: -1b + b = 0 A + 3a + 0 + b + -1b = 0 A + 3a + b + -1b = 0 Combine like terms: b + -1b = 0 A + 3a + 0 = 0 A + 3a = 0 Solving A + 3a = 0 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-3a' to each side of the equation. A + 3a + -3a = 0 + -3a Combine like terms: 3a + -3a = 0 A + 0 = 0 + -3a A = 0 + -3a Remove the zero: A = -3a Simplifying A = -3a
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