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Simplifying 7 + 4(s + -5t) = 0 7 + (s * 4 + -5t * 4) = 0 7 + (4s + -20t) = 0 Solving 7 + 4s + -20t = 0 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + 4s + -7 + -20t = 0 + -7 Reorder the terms: 7 + -7 + 4s + -20t = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 4s + -20t = 0 + -7 4s + -20t = 0 + -7 Combine like terms: 0 + -7 = -7 4s + -20t = -7 Add '20t' to each side of the equation. 4s + -20t + 20t = -7 + 20t Combine like terms: -20t + 20t = 0 4s + 0 = -7 + 20t 4s = -7 + 20t Divide each side by '4'. s = -1.75 + 5t Simplifying s = -1.75 + 5t
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