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Simplifying 8a + 5a + -7 = 31 Reorder the terms: -7 + 8a + 5a = 31 Combine like terms: 8a + 5a = 13a -7 + 13a = 31 Solving -7 + 13a = 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 + 13a = 31 + 7 Combine like terms: -7 + 7 = 0 0 + 13a = 31 + 7 13a = 31 + 7 Combine like terms: 31 + 7 = 38 13a = 38 Divide each side by '13'. a = 2.923076923 Simplifying a = 2.923076923
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