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Simplifying 9 = 21 + -4s Solving 9 = 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. 9 + 4s = 21 + -4s + 4s Combine like terms: -4s + 4s = 0 9 + 4s = 21 + 0 9 + 4s = 21 Add '-9' to each side of the equation. 9 + -9 + 4s = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 4s = 21 + -9 4s = 21 + -9 Combine like terms: 21 + -9 = 12 4s = 12 Divide each side by '4'. s = 3 Simplifying s = 3
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