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Simplifying -1a + 21 = 9 Reorder the terms: 21 + -1a = 9 Solving 21 + -1a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1a = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 9 + -21 -1a = 9 + -21 Combine like terms: 9 + -21 = -12 -1a = -12 Divide each side by '-1'. a = 12 Simplifying a = 12
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