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Simplifying 21 + -1y = -87 + -2y Solving 21 + -1y = -87 + -2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2y' to each side of the equation. 21 + -1y + 2y = -87 + -2y + 2y Combine like terms: -1y + 2y = 1y 21 + 1y = -87 + -2y + 2y Combine like terms: -2y + 2y = 0 21 + 1y = -87 + 0 21 + 1y = -87 Add '-21' to each side of the equation. 21 + -21 + 1y = -87 + -21 Combine like terms: 21 + -21 = 0 0 + 1y = -87 + -21 1y = -87 + -21 Combine like terms: -87 + -21 = -108 1y = -108 Divide each side by '1'. y = -108 Simplifying y = -108
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