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Simplifying 23 = 9 + -7a Solving 23 = 9 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 23 + 7a = 9 + -7a + 7a Combine like terms: -7a + 7a = 0 23 + 7a = 9 + 0 23 + 7a = 9 Add '-23' to each side of the equation. 23 + -23 + 7a = 9 + -23 Combine like terms: 23 + -23 = 0 0 + 7a = 9 + -23 7a = 9 + -23 Combine like terms: 9 + -23 = -14 7a = -14 Divide each side by '7'. a = -2 Simplifying a = -2
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