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Simplifying 5a + 15 + -1a = 31 Reorder the terms: 15 + 5a + -1a = 31 Combine like terms: 5a + -1a = 4a 15 + 4a = 31 Solving 15 + 4a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4a = 31 + -15 Combine like terms: 15 + -15 = 0 0 + 4a = 31 + -15 4a = 31 + -15 Combine like terms: 31 + -15 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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