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Simplifying 20 = 3s + -4(30 + -1s) 20 = 3s + (30 * -4 + -1s * -4) 20 = 3s + (-120 + 4s) Reorder the terms: 20 = -120 + 3s + 4s Combine like terms: 3s + 4s = 7s 20 = -120 + 7s Solving 20 = -120 + 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. 20 + -7s = -120 + 7s + -7s Combine like terms: 7s + -7s = 0 20 + -7s = -120 + 0 20 + -7s = -120 Add '-20' to each side of the equation. 20 + -20 + -7s = -120 + -20 Combine like terms: 20 + -20 = 0 0 + -7s = -120 + -20 -7s = -120 + -20 Combine like terms: -120 + -20 = -140 -7s = -140 Divide each side by '-7'. s = 20 Simplifying s = 20
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