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Simplifying 3(a + 7) = 28.2 Reorder the terms: 3(7 + a) = 28.2 (7 * 3 + a * 3) = 28.2 (21 + 3a) = 28.2 Solving 21 + 3a = 28.2 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 + 3a = 28.2 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 28.2 + -21 3a = 28.2 + -21 Combine like terms: 28.2 + -21 = 7.2 3a = 7.2 Divide each side by '3'. a = 2.4 Simplifying a = 2.4
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