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Simplifying 3(3a + 3) + n = 20 Reorder the terms: 3(3 + 3a) + n = 20 (3 * 3 + 3a * 3) + n = 20 (9 + 9a) + n = 20 Solving 9 + 9a + n = 20 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 + 9a + -9 + n = 20 + -9 Reorder the terms: 9 + -9 + 9a + n = 20 + -9 Combine like terms: 9 + -9 = 0 0 + 9a + n = 20 + -9 9a + n = 20 + -9 Combine like terms: 20 + -9 = 11 9a + n = 11 Add '-1n' to each side of the equation. 9a + n + -1n = 11 + -1n Combine like terms: n + -1n = 0 9a + 0 = 11 + -1n 9a = 11 + -1n Divide each side by '9'. a = 1.222222222 + -0.1111111111n Simplifying a = 1.222222222 + -0.1111111111n
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