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Simplifying 5a + 7(3 + a) = 0 5a + (3 * 7 + a * 7) = 0 5a + (21 + 7a) = 0 Reorder the terms: 21 + 5a + 7a = 0 Combine like terms: 5a + 7a = 12a 21 + 12a = 0 Solving 21 + 12a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 12a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 12a = 0 + -21 12a = 0 + -21 Combine like terms: 0 + -21 = -21 12a = -21 Divide each side by '12'. a = -1.75 Simplifying a = -1.75
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