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Simplifying 7s + 420 = 21s Reorder the terms: 420 + 7s = 21s Solving 420 + 7s = 21s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-21s' to each side of the equation. 420 + 7s + -21s = 21s + -21s Combine like terms: 7s + -21s = -14s 420 + -14s = 21s + -21s Combine like terms: 21s + -21s = 0 420 + -14s = 0 Add '-420' to each side of the equation. 420 + -420 + -14s = 0 + -420 Combine like terms: 420 + -420 = 0 0 + -14s = 0 + -420 -14s = 0 + -420 Combine like terms: 0 + -420 = -420 -14s = -420 Divide each side by '-14'. s = 30 Simplifying s = 30
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