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Simplifying -12 = 9a + 9 + 6 Reorder the terms: -12 = 9 + 6 + 9a Combine like terms: 9 + 6 = 15 -12 = 15 + 9a Solving -12 = 15 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -12 + -9a = 15 + 9a + -9a Combine like terms: 9a + -9a = 0 -12 + -9a = 15 + 0 -12 + -9a = 15 Add '12' to each side of the equation. -12 + 12 + -9a = 15 + 12 Combine like terms: -12 + 12 = 0 0 + -9a = 15 + 12 -9a = 15 + 12 Combine like terms: 15 + 12 = 27 -9a = 27 Divide each side by '-9'. a = -3 Simplifying a = -3
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