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Simplifying 7(3a + 12) = 168 Reorder the terms: 7(12 + 3a) = 168 (12 * 7 + 3a * 7) = 168 (84 + 21a) = 168 Solving 84 + 21a = 168 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 21a = 168 + -84 Combine like terms: 84 + -84 = 0 0 + 21a = 168 + -84 21a = 168 + -84 Combine like terms: 168 + -84 = 84 21a = 84 Divide each side by '21'. a = 4 Simplifying a = 4
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