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Simplifying 7a + 15 + a = 55 Reorder the terms: 15 + 7a + a = 55 Combine like terms: 7a + a = 8a 15 + 8a = 55 Solving 15 + 8a = 55 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 + 8a = 55 + -15 Combine like terms: 15 + -15 = 0 0 + 8a = 55 + -15 8a = 55 + -15 Combine like terms: 55 + -15 = 40 8a = 40 Divide each side by '8'. a = 5 Simplifying a = 5
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