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Simplifying 6 + a + (a + 3) + 3 = 81 Reorder the terms: 6 + a + (3 + a) + 3 = 81 Remove parenthesis around (3 + a) 6 + a + 3 + a + 3 = 81 Reorder the terms: 6 + 3 + 3 + a + a = 81 Combine like terms: 6 + 3 = 9 9 + 3 + a + a = 81 Combine like terms: 9 + 3 = 12 12 + a + a = 81 Combine like terms: a + a = 2a 12 + 2a = 81 Solving 12 + 2a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2a = 81 + -12 Combine like terms: 12 + -12 = 0 0 + 2a = 81 + -12 2a = 81 + -12 Combine like terms: 81 + -12 = 69 2a = 69 Divide each side by '2'. a = 34.5 Simplifying a = 34.5
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