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Simplifying 3s + -21 = -21 + 9s Reorder the terms: -21 + 3s = -21 + 9s Add '21' to each side of the equation. -21 + 21 + 3s = -21 + 21 + 9s Combine like terms: -21 + 21 = 0 0 + 3s = -21 + 21 + 9s 3s = -21 + 21 + 9s Combine like terms: -21 + 21 = 0 3s = 0 + 9s 3s = 9s Solving 3s = 9s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-9s' to each side of the equation. 3s + -9s = 9s + -9s Combine like terms: 3s + -9s = -6s -6s = 9s + -9s Combine like terms: 9s + -9s = 0 -6s = 0 Divide each side by '-6'. s = 0 Simplifying s = 0
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