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Simplifying 640 + 30s = 450 + 25s Solving 640 + 30s = 450 + 25s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-25s' to each side of the equation. 640 + 30s + -25s = 450 + 25s + -25s Combine like terms: 30s + -25s = 5s 640 + 5s = 450 + 25s + -25s Combine like terms: 25s + -25s = 0 640 + 5s = 450 + 0 640 + 5s = 450 Add '-640' to each side of the equation. 640 + -640 + 5s = 450 + -640 Combine like terms: 640 + -640 = 0 0 + 5s = 450 + -640 5s = 450 + -640 Combine like terms: 450 + -640 = -190 5s = -190 Divide each side by '5'. s = -38 Simplifying s = -38
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