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Simplifying -21 = -2y + 9 Reorder the terms: -21 = 9 + -2y Solving -21 = 9 + -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 = 9 + -2y + 2y Combine like terms: -2y + 2y = 0 -21 + 2y = 9 + 0 -21 + 2y = 9 Add '21' to each side of the equation. -21 + 21 + 2y = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 2y = 9 + 21 2y = 9 + 21 Combine like terms: 9 + 21 = 30 2y = 30 Divide each side by '2'. y = 15 Simplifying y = 15
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