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Simplifying 3s + -21 = 9 + 7s Reorder the terms: -21 + 3s = 9 + 7s Solving -21 + 3s = 9 + 7s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-7s' to each side of the equation. -21 + 3s + -7s = 9 + 7s + -7s Combine like terms: 3s + -7s = -4s -21 + -4s = 9 + 7s + -7s Combine like terms: 7s + -7s = 0 -21 + -4s = 9 + 0 -21 + -4s = 9 Add '21' to each side of the equation. -21 + 21 + -4s = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -4s = 9 + 21 -4s = 9 + 21 Combine like terms: 9 + 21 = 30 -4s = 30 Divide each side by '-4'. s = -7.5 Simplifying s = -7.5
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