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Simplifying -1a + 3 = 12 Reorder the terms: 3 + -1a = 12 Solving 3 + -1a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1a = 12 + -3 Combine like terms: 3 + -3 = 0 0 + -1a = 12 + -3 -1a = 12 + -3 Combine like terms: 12 + -3 = 9 -1a = 9 Divide each side by '-1'. a = -9 Simplifying a = -9
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