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Simplifying -9 = -3(2 + -1a) -9 = (2 * -3 + -1a * -3) -9 = (-6 + 3a) Solving -9 = -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. -9 + -3a = -6 + 3a + -3a Combine like terms: 3a + -3a = 0 -9 + -3a = -6 + 0 -9 + -3a = -6 Add '9' to each side of the equation. -9 + 9 + -3a = -6 + 9 Combine like terms: -9 + 9 = 0 0 + -3a = -6 + 9 -3a = -6 + 9 Combine like terms: -6 + 9 = 3 -3a = 3 Divide each side by '-3'. a = -1 Simplifying a = -1
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