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Simplifying -9s + -1(-9) + -4s = -20 Multiply -1 * -9 -9s + 9 + -4s = -20 Reorder the terms: 9 + -9s + -4s = -20 Combine like terms: -9s + -4s = -13s 9 + -13s = -20 Solving 9 + -13s = -20 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -13s = -20 + -9 Combine like terms: 9 + -9 = 0 0 + -13s = -20 + -9 -13s = -20 + -9 Combine like terms: -20 + -9 = -29 -13s = -29 Divide each side by '-13'. s = 2.230769231 Simplifying s = 2.230769231
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