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Simplifying -21 = 7s Solving -21 = 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 + -7s = 7s + -7s Combine like terms: 7s + -7s = 0 -21 + -7s = 0 Add '21' to each side of the equation. -21 + 21 + -7s = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7s = 0 + 21 -7s = 0 + 21 Combine like terms: 0 + 21 = 21 -7s = 21 Divide each side by '-7'. s = -3 Simplifying s = -3
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