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Simplifying 8 = 428 + -21x Solving 8 = 428 + -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. 8 + 21x = 428 + -21x + 21x Combine like terms: -21x + 21x = 0 8 + 21x = 428 + 0 8 + 21x = 428 Add '-8' to each side of the equation. 8 + -8 + 21x = 428 + -8 Combine like terms: 8 + -8 = 0 0 + 21x = 428 + -8 21x = 428 + -8 Combine like terms: 428 + -8 = 420 21x = 420 Divide each side by '21'. x = 20 Simplifying x = 20
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