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Simplifying 7(a + 3) = 9 Reorder the terms: 7(3 + a) = 9 (3 * 7 + a * 7) = 9 (21 + 7a) = 9 Solving 21 + 7a = 9 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 + 7a = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 7a = 9 + -21 7a = 9 + -21 Combine like terms: 9 + -21 = -12 7a = -12 Divide each side by '7'. a = -1.714285714 Simplifying a = -1.714285714
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