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