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Simplifying (3 + a) + (2a) + a = 15 Remove parenthesis around (3 + a) 3 + a + (2a) + a = 15 Combine like terms: a + (2a) = 3a 3 + 3a + a = 15 Combine like terms: 3a + a = 4a 3 + 4a = 15 Solving 3 + 4a = 15 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 = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 4a = 15 + -3 4a = 15 + -3 Combine like terms: 15 + -3 = 12 4a = 12 Divide each side by '4'. a = 3 Simplifying a = 3
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