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Simplifying 15 = -3(2a + -1) Reorder the terms: 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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