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Simplifying 400 = 21x Solving 400 = 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. 400 + -21x = 21x + -21x Combine like terms: 21x + -21x = 0 400 + -21x = 0 Add '-400' to each side of the equation. 400 + -400 + -21x = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -21x = 0 + -400 -21x = 0 + -400 Combine like terms: 0 + -400 = -400 -21x = -400 Divide each side by '-21'. x = 19.04761905 Simplifying x = 19.04761905
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