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Simplifying 18 = 3s + -4(20 + -1s) 18 = 3s + (20 * -4 + -1s * -4) 18 = 3s + (-80 + 4s) Reorder the terms: 18 = -80 + 3s + 4s Combine like terms: 3s + 4s = 7s 18 = -80 + 7s Solving 18 = -80 + 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. 18 + -7s = -80 + 7s + -7s Combine like terms: 7s + -7s = 0 18 + -7s = -80 + 0 18 + -7s = -80 Add '-18' to each side of the equation. 18 + -18 + -7s = -80 + -18 Combine like terms: 18 + -18 = 0 0 + -7s = -80 + -18 -7s = -80 + -18 Combine like terms: -80 + -18 = -98 -7s = -98 Divide each side by '-7'. s = 14 Simplifying s = 14
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