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Simplifying 9(a + 7) = 90 Reorder the terms: 9(7 + a) = 90 (7 * 9 + a * 9) = 90 (63 + 9a) = 90 Solving 63 + 9a = 90 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 = 90 + -63 Combine like terms: 63 + -63 = 0 0 + 9a = 90 + -63 9a = 90 + -63 Combine like terms: 90 + -63 = 27 9a = 27 Divide each side by '9'. a = 3 Simplifying a = 3
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