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Simplifying 21 = 7s + -7 Reorder the terms: 21 = -7 + 7s Solving 21 = -7 + 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 = -7 + 7s + -7s Combine like terms: 7s + -7s = 0 21 + -7s = -7 + 0 21 + -7s = -7 Add '-21' to each side of the equation. 21 + -21 + -7s = -7 + -21 Combine like terms: 21 + -21 = 0 0 + -7s = -7 + -21 -7s = -7 + -21 Combine like terms: -7 + -21 = -28 -7s = -28 Divide each side by '-7'. s = 4 Simplifying s = 4
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