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Simplifying 21 = 4s Solving 21 = 4s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4s' to each side of the equation. 21 + -4s = 4s + -4s Combine like terms: 4s + -4s = 0 21 + -4s = 0 Add '-21' to each side of the equation. 21 + -21 + -4s = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -4s = 0 + -21 -4s = 0 + -21 Combine like terms: 0 + -21 = -21 -4s = -21 Divide each side by '-4'. s = 5.25 Simplifying s = 5.25
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