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Simplifying 25 + -1y = -639 Solving 25 + -1y = -639 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -1y = -639 + -25 Combine like terms: 25 + -25 = 0 0 + -1y = -639 + -25 -1y = -639 + -25 Combine like terms: -639 + -25 = -664 -1y = -664 Divide each side by '-1'. y = 664 Simplifying y = 664
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