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Simplifying 3a + 7b + 4 + 7a = 0 Reorder the terms: 4 + 3a + 7a + 7b = 0 Combine like terms: 3a + 7a = 10a 4 + 10a + 7b = 0 Solving 4 + 10a + 7b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + 10a + -4 + 7b = 0 + -4 Reorder the terms: 4 + -4 + 10a + 7b = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 10a + 7b = 0 + -4 10a + 7b = 0 + -4 Combine like terms: 0 + -4 = -4 10a + 7b = -4 Add '-7b' to each side of the equation. 10a + 7b + -7b = -4 + -7b Combine like terms: 7b + -7b = 0 10a + 0 = -4 + -7b 10a = -4 + -7b Divide each side by '10'. a = -0.4 + -0.7b Simplifying a = -0.4 + -0.7b
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