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Simplifying 15 = 9 + -3(a + 2) Reorder the terms: 15 = 9 + -3(2 + a) 15 = 9 + (2 * -3 + a * -3) 15 = 9 + (-6 + -3a) Combine like terms: 9 + -6 = 3 15 = 3 + -3a Solving 15 = 3 + -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 = 3 + -3a + 3a Combine like terms: -3a + 3a = 0 15 + 3a = 3 + 0 15 + 3a = 3 Add '-15' to each side of the equation. 15 + -15 + 3a = 3 + -15 Combine like terms: 15 + -15 = 0 0 + 3a = 3 + -15 3a = 3 + -15 Combine like terms: 3 + -15 = -12 3a = -12 Divide each side by '3'. a = -4 Simplifying a = -4
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