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Simplifying 1.05(20 + 9x) = 42 (20 * 1.05 + 9x * 1.05) = 42 (21 + 9.45x) = 42 Solving 21 + 9.45x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 9.45x = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 9.45x = 42 + -21 9.45x = 42 + -21 Combine like terms: 42 + -21 = 21 9.45x = 21 Divide each side by '9.45'. x = 2.222222222 Simplifying x = 2.222222222
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