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Simplifying 3(a + 6) = 21.9 Reorder the terms: 3(6 + a) = 21.9 (6 * 3 + a * 3) = 21.9 (18 + 3a) = 21.9 Solving 18 + 3a = 21.9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 3a = 21.9 + -18 Combine like terms: 18 + -18 = 0 0 + 3a = 21.9 + -18 3a = 21.9 + -18 Combine like terms: 21.9 + -18 = 3.9 3a = 3.9 Divide each side by '3'. a = 1.3 Simplifying a = 1.3
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