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Simplifying 21 = 12 + -1y Solving 21 = 12 + -1y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add 'y' to each side of the equation. 21 + y = 12 + -1y + y Combine like terms: -1y + y = 0 21 + y = 12 + 0 21 + y = 12 Add '-21' to each side of the equation. 21 + -21 + y = 12 + -21 Combine like terms: 21 + -21 = 0 0 + y = 12 + -21 y = 12 + -21 Combine like terms: 12 + -21 = -9 y = -9 Simplifying y = -9
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