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Simplifying 2(a + 9) = 31.4 Reorder the terms: 2(9 + a) = 31.4 (9 * 2 + a * 2) = 31.4 (18 + 2a) = 31.4 Solving 18 + 2a = 31.4 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 + 2a = 31.4 + -18 Combine like terms: 18 + -18 = 0 0 + 2a = 31.4 + -18 2a = 31.4 + -18 Combine like terms: 31.4 + -18 = 13.4 2a = 13.4 Divide each side by '2'. a = 6.7 Simplifying a = 6.7
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