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Simplifying 13a + 8 + -7a = 15 Reorder the terms: 8 + 13a + -7a = 15 Combine like terms: 13a + -7a = 6a 8 + 6a = 15 Solving 8 + 6a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 6a = 15 + -8 Combine like terms: 8 + -8 = 0 0 + 6a = 15 + -8 6a = 15 + -8 Combine like terms: 15 + -8 = 7 6a = 7 Divide each side by '6'. a = 1.166666667 Simplifying a = 1.166666667
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