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Simplifying 0.66(5x + 7) = 21 Reorder the terms: 0.66(7 + 5x) = 21 (7 * 0.66 + 5x * 0.66) = 21 (4.62 + 3.3x) = 21 Solving 4.62 + 3.3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.62' to each side of the equation. 4.62 + -4.62 + 3.3x = 21 + -4.62 Combine like terms: 4.62 + -4.62 = 0.00 0.00 + 3.3x = 21 + -4.62 3.3x = 21 + -4.62 Combine like terms: 21 + -4.62 = 16.38 3.3x = 16.38 Divide each side by '3.3'. x = 4.963636364 Simplifying x = 4.963636364
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