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Simplifying -9 = 3a + -6a + 12 Reorder the terms: -9 = 12 + 3a + -6a Combine like terms: 3a + -6a = -3a -9 = 12 + -3a Solving -9 = 12 + -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 = 12 + -3a + 3a Combine like terms: -3a + 3a = 0 -9 + 3a = 12 + 0 -9 + 3a = 12 Add '9' to each side of the equation. -9 + 9 + 3a = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3a = 12 + 9 3a = 12 + 9 Combine like terms: 12 + 9 = 21 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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