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Simplifying 8a + -5a + 7 = 31 Reorder the terms: 7 + 8a + -5a = 31 Combine like terms: 8a + -5a = 3a 7 + 3a = 31 Solving 7 + 3a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3a = 31 + -7 Combine like terms: 7 + -7 = 0 0 + 3a = 31 + -7 3a = 31 + -7 Combine like terms: 31 + -7 = 24 3a = 24 Divide each side by '3'. a = 8 Simplifying a = 8
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