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Simplifying 21 = 3s + -4(21 + -1s) 21 = 3s + (21 * -4 + -1s * -4) 21 = 3s + (-84 + 4s) Reorder the terms: 21 = -84 + 3s + 4s Combine like terms: 3s + 4s = 7s 21 = -84 + 7s Solving 21 = -84 + 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 = -84 + 7s + -7s Combine like terms: 7s + -7s = 0 21 + -7s = -84 + 0 21 + -7s = -84 Add '-21' to each side of the equation. 21 + -21 + -7s = -84 + -21 Combine like terms: 21 + -21 = 0 0 + -7s = -84 + -21 -7s = -84 + -21 Combine like terms: -84 + -21 = -105 -7s = -105 Divide each side by '-7'. s = 15 Simplifying s = 15
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