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Simplifying 13s + 21 = 4s Reorder the terms: 21 + 13s = 4s Solving 21 + 13s = 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 + 13s + -4s = 4s + -4s Combine like terms: 13s + -4s = 9s 21 + 9s = 4s + -4s Combine like terms: 4s + -4s = 0 21 + 9s = 0 Add '-21' to each side of the equation. 21 + -21 + 9s = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 9s = 0 + -21 9s = 0 + -21 Combine like terms: 0 + -21 = -21 9s = -21 Divide each side by '9'. s = -2.333333333 Simplifying s = -2.333333333
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