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