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Simplifying 6a + 7 + -1a = 78 Reorder the terms: 7 + 6a + -1a = 78 Combine like terms: 6a + -1a = 5a 7 + 5a = 78 Solving 7 + 5a = 78 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 + 5a = 78 + -7 Combine like terms: 7 + -7 = 0 0 + 5a = 78 + -7 5a = 78 + -7 Combine like terms: 78 + -7 = 71 5a = 71 Divide each side by '5'. a = 14.2 Simplifying a = 14.2
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