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Simplifying 3(a + -9) = 15 Reorder the terms: 3(-9 + a) = 15 (-9 * 3 + a * 3) = 15 (-27 + 3a) = 15 Solving -27 + 3a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 3a = 15 + 27 Combine like terms: -27 + 27 = 0 0 + 3a = 15 + 27 3a = 15 + 27 Combine like terms: 15 + 27 = 42 3a = 42 Divide each side by '3'. a = 14 Simplifying a = 14
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