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Simplifying 21x + 9 = 12 + 6 Reorder the terms: 9 + 21x = 12 + 6 Combine like terms: 12 + 6 = 18 9 + 21x = 18 Solving 9 + 21x = 18 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 = 18 + -9 Combine like terms: 9 + -9 = 0 0 + 21x = 18 + -9 21x = 18 + -9 Combine like terms: 18 + -9 = 9 21x = 9 Divide each side by '21'. x = 0.4285714286 Simplifying x = 0.4285714286
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