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