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Simplifying 7(3a + 3) = 189 Reorder the terms: 7(3 + 3a) = 189 (3 * 7 + 3a * 7) = 189 (21 + 21a) = 189 Solving 21 + 21a = 189 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 + 21a = 189 + -21 Combine like terms: 21 + -21 = 0 0 + 21a = 189 + -21 21a = 189 + -21 Combine like terms: 189 + -21 = 168 21a = 168 Divide each side by '21'. a = 8 Simplifying a = 8
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