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Simplifying 7(a + b) + 2(a + -3b) = 0 (a * 7 + b * 7) + 2(a + -3b) = 0 (7a + 7b) + 2(a + -3b) = 0 7a + 7b + (a * 2 + -3b * 2) = 0 7a + 7b + (2a + -6b) = 0 Reorder the terms: 7a + 2a + 7b + -6b = 0 Combine like terms: 7a + 2a = 9a 9a + 7b + -6b = 0 Combine like terms: 7b + -6b = 1b 9a + 1b = 0 Solving 9a + 1b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1b' to each side of the equation. 9a + 1b + -1b = 0 + -1b Combine like terms: 1b + -1b = 0 9a + 0 = 0 + -1b 9a = 0 + -1b Remove the zero: 9a = -1b Divide each side by '9'. a = -0.1111111111b Simplifying a = -0.1111111111b
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