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Simplifying 9 = 20 + -1a Solving 9 = 20 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 9 + a = 20 + -1a + a Combine like terms: -1a + a = 0 9 + a = 20 + 0 9 + a = 20 Add '-9' to each side of the equation. 9 + -9 + a = 20 + -9 Combine like terms: 9 + -9 = 0 0 + a = 20 + -9 a = 20 + -9 Combine like terms: 20 + -9 = 11 a = 11 Simplifying a = 11
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