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Simplifying 9(a + 7) = 117.9 Reorder the terms: 9(7 + a) = 117.9 (7 * 9 + a * 9) = 117.9 (63 + 9a) = 117.9 Solving 63 + 9a = 117.9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 9a = 117.9 + -63 Combine like terms: 63 + -63 = 0 0 + 9a = 117.9 + -63 9a = 117.9 + -63 Combine like terms: 117.9 + -63 = 54.9 9a = 54.9 Divide each side by '9'. a = 6.1 Simplifying a = 6.1
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