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Simplifying 21 = 3 + -21x Solving 21 = 3 + -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. 21 + 21x = 3 + -21x + 21x Combine like terms: -21x + 21x = 0 21 + 21x = 3 + 0 21 + 21x = 3 Add '-21' to each side of the equation. 21 + -21 + 21x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 21x = 3 + -21 21x = 3 + -21 Combine like terms: 3 + -21 = -18 21x = -18 Divide each side by '21'. x = -0.8571428571 Simplifying x = -0.8571428571
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