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Simplifying 15 = 3[1 + -2a] 15 = [1 * 3 + -2a * 3] 15 = [3 + -6a] Solving 15 = 3 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. 15 + 6a = 3 + -6a + 6a Combine like terms: -6a + 6a = 0 15 + 6a = 3 + 0 15 + 6a = 3 Add '-15' to each side of the equation. 15 + -15 + 6a = 3 + -15 Combine like terms: 15 + -15 = 0 0 + 6a = 3 + -15 6a = 3 + -15 Combine like terms: 3 + -15 = -12 6a = -12 Divide each side by '6'. a = -2 Simplifying a = -2
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