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Simplifying 2a + (3 + a) + a = 39 Remove parenthesis around (3 + a) 2a + 3 + a + a = 39 Reorder the terms: 3 + 2a + a + a = 39 Combine like terms: 2a + a = 3a 3 + 3a + a = 39 Combine like terms: 3a + a = 4a 3 + 4a = 39 Solving 3 + 4a = 39 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4a = 39 + -3 Combine like terms: 3 + -3 = 0 0 + 4a = 39 + -3 4a = 39 + -3 Combine like terms: 39 + -3 = 36 4a = 36 Divide each side by '4'. a = 9 Simplifying a = 9
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