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Simplifying 28 = 3s + -4(28 + -1s) 28 = 3s + (28 * -4 + -1s * -4) 28 = 3s + (-112 + 4s) Reorder the terms: 28 = -112 + 3s + 4s Combine like terms: 3s + 4s = 7s 28 = -112 + 7s Solving 28 = -112 + 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. 28 + -7s = -112 + 7s + -7s Combine like terms: 7s + -7s = 0 28 + -7s = -112 + 0 28 + -7s = -112 Add '-28' to each side of the equation. 28 + -28 + -7s = -112 + -28 Combine like terms: 28 + -28 = 0 0 + -7s = -112 + -28 -7s = -112 + -28 Combine like terms: -112 + -28 = -140 -7s = -140 Divide each side by '-7'. s = 20 Simplifying s = 20
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