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Simplifying 840 = 21k Solving 840 = 21k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-21k' to each side of the equation. 840 + -21k = 21k + -21k Combine like terms: 21k + -21k = 0 840 + -21k = 0 Add '-840' to each side of the equation. 840 + -840 + -21k = 0 + -840 Combine like terms: 840 + -840 = 0 0 + -21k = 0 + -840 -21k = 0 + -840 Combine like terms: 0 + -840 = -840 -21k = -840 Divide each side by '-21'. k = 40 Simplifying k = 40
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