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Simplifying 3(3a + -3) + 6 = 81 Reorder the terms: 3(-3 + 3a) + 6 = 81 (-3 * 3 + 3a * 3) + 6 = 81 (-9 + 9a) + 6 = 81 Reorder the terms: -9 + 6 + 9a = 81 Combine like terms: -9 + 6 = -3 -3 + 9a = 81 Solving -3 + 9a = 81 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 + 9a = 81 + 3 Combine like terms: -3 + 3 = 0 0 + 9a = 81 + 3 9a = 81 + 3 Combine like terms: 81 + 3 = 84 9a = 84 Divide each side by '9'. a = 9.333333333 Simplifying a = 9.333333333
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