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Simplifying (2 + a) * 9 = 90 Reorder the terms for easier multiplication: 9(2 + a) = 90 (2 * 9 + a * 9) = 90 (18 + 9a) = 90 Solving 18 + 9a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 9a = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 9a = 90 + -18 9a = 90 + -18 Combine like terms: 90 + -18 = 72 9a = 72 Divide each side by '9'. a = 8 Simplifying a = 8
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