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Simplifying 7(a + 9) = 126 Reorder the terms: 7(9 + a) = 126 (9 * 7 + a * 7) = 126 (63 + 7a) = 126 Solving 63 + 7a = 126 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 + 7a = 126 + -63 Combine like terms: 63 + -63 = 0 0 + 7a = 126 + -63 7a = 126 + -63 Combine like terms: 126 + -63 = 63 7a = 63 Divide each side by '7'. a = 9 Simplifying a = 9
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