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Simplifying (2a + -8) + 15 = 13 Reorder the terms: (-8 + 2a) + 15 = 13 Remove parenthesis around (-8 + 2a) -8 + 2a + 15 = 13 Reorder the terms: -8 + 15 + 2a = 13 Combine like terms: -8 + 15 = 7 7 + 2a = 13 Solving 7 + 2a = 13 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 + 2a = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 2a = 13 + -7 2a = 13 + -7 Combine like terms: 13 + -7 = 6 2a = 6 Divide each side by '2'. a = 3 Simplifying a = 3
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