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Simplifying 3 + 42x = 21x + 21 Reorder the terms: 3 + 42x = 21 + 21x Solving 3 + 42x = 21 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 3 + 42x + -21x = 21 + 21x + -21x Combine like terms: 42x + -21x = 21x 3 + 21x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 3 + 21x = 21 + 0 3 + 21x = 21 Add '-3' to each side of the equation. 3 + -3 + 21x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 21x = 21 + -3 21x = 21 + -3 Combine like terms: 21 + -3 = 18 21x = 18 Divide each side by '21'. x = 0.8571428571 Simplifying x = 0.8571428571
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