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Simplifying 7(a + 7) = 77.7 Reorder the terms: 7(7 + a) = 77.7 (7 * 7 + a * 7) = 77.7 (49 + 7a) = 77.7 Solving 49 + 7a = 77.7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 7a = 77.7 + -49 Combine like terms: 49 + -49 = 0 0 + 7a = 77.7 + -49 7a = 77.7 + -49 Combine like terms: 77.7 + -49 = 28.7 7a = 28.7 Divide each side by '7'. a = 4.1 Simplifying a = 4.1
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