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Simplifying 21 = 5 + -2y Solving 21 = 5 + -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 + 2y = 5 + -2y + 2y Combine like terms: -2y + 2y = 0 21 + 2y = 5 + 0 21 + 2y = 5 Add '-21' to each side of the equation. 21 + -21 + 2y = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 2y = 5 + -21 2y = 5 + -21 Combine like terms: 5 + -21 = -16 2y = -16 Divide each side by '2'. y = -8 Simplifying y = -8
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