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Simplifying 3 + a + a + 2(3 + a) = 57 3 + a + a + (3 * 2 + a * 2) = 57 3 + a + a + (6 + 2a) = 57 Reorder the terms: 3 + 6 + a + a + 2a = 57 Combine like terms: 3 + 6 = 9 9 + a + a + 2a = 57 Combine like terms: a + a = 2a 9 + 2a + 2a = 57 Combine like terms: 2a + 2a = 4a 9 + 4a = 57 Solving 9 + 4a = 57 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4a = 57 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = 57 + -9 4a = 57 + -9 Combine like terms: 57 + -9 = 48 4a = 48 Divide each side by '4'. a = 12 Simplifying a = 12
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