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Simplifying 23 = 7 + -2a Solving 23 = 7 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 23 + 2a = 7 + -2a + 2a Combine like terms: -2a + 2a = 0 23 + 2a = 7 + 0 23 + 2a = 7 Add '-23' to each side of the equation. 23 + -23 + 2a = 7 + -23 Combine like terms: 23 + -23 = 0 0 + 2a = 7 + -23 2a = 7 + -23 Combine like terms: 7 + -23 = -16 2a = -16 Divide each side by '2'. a = -8 Simplifying a = -8
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