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Simplifying 2(a + 2a) + 9 = 99 Combine like terms: a + 2a = 3a 2(3a) + 9 = 99 Remove parenthesis around (3a) 2 * 3a + 9 = 99 Multiply 2 * 3 6a + 9 = 99 Reorder the terms: 9 + 6a = 99 Solving 9 + 6a = 99 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 + 6a = 99 + -9 Combine like terms: 9 + -9 = 0 0 + 6a = 99 + -9 6a = 99 + -9 Combine like terms: 99 + -9 = 90 6a = 90 Divide each side by '6'. a = 15 Simplifying a = 15
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