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Simplifying 3(7x + 3) = 45 Reorder the terms: 3(3 + 7x) = 45 (3 * 3 + 7x * 3) = 45 (9 + 21x) = 45 Solving 9 + 21x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 21x = 45 + -9 Combine like terms: 9 + -9 = 0 0 + 21x = 45 + -9 21x = 45 + -9 Combine like terms: 45 + -9 = 36 21x = 36 Divide each side by '21'. x = 1.714285714 Simplifying x = 1.714285714
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