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Simplifying 21 = 3s + -7s Combine like terms: 3s + -7s = -4s 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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