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Simplifying 0.7(x + 9) = 21 Reorder the terms: 0.7(9 + x) = 21 (9 * 0.7 + x * 0.7) = 21 (6.3 + 0.7x) = 21 Solving 6.3 + 0.7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.3' to each side of the equation. 6.3 + -6.3 + 0.7x = 21 + -6.3 Combine like terms: 6.3 + -6.3 = 0.0 0.0 + 0.7x = 21 + -6.3 0.7x = 21 + -6.3 Combine like terms: 21 + -6.3 = 14.7 0.7x = 14.7 Divide each side by '0.7'. x = 21 Simplifying x = 21
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