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Simplifying 0.66(3x + 9) = 21 Reorder the terms: 0.66(9 + 3x) = 21 (9 * 0.66 + 3x * 0.66) = 21 (5.94 + 1.98x) = 21 Solving 5.94 + 1.98x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.94' to each side of the equation. 5.94 + -5.94 + 1.98x = 21 + -5.94 Combine like terms: 5.94 + -5.94 = 0.00 0.00 + 1.98x = 21 + -5.94 1.98x = 21 + -5.94 Combine like terms: 21 + -5.94 = 15.06 1.98x = 15.06 Divide each side by '1.98'. x = 7.606060606 Simplifying x = 7.606060606
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