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Simplifying 15 = 3(a + 3) Reorder the terms: 15 = 3(3 + a) 15 = (3 * 3 + a * 3) 15 = (9 + 3a) Solving 15 = 9 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 15 + -3a = 9 + 3a + -3a Combine like terms: 3a + -3a = 0 15 + -3a = 9 + 0 15 + -3a = 9 Add '-15' to each side of the equation. 15 + -15 + -3a = 9 + -15 Combine like terms: 15 + -15 = 0 0 + -3a = 9 + -15 -3a = 9 + -15 Combine like terms: 9 + -15 = -6 -3a = -6 Divide each side by '-3'. a = 2 Simplifying a = 2
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