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Simplifying -21 + 30 = -3y Combine like terms: -21 + 30 = 9 9 = -3y Solving 9 = -3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3y' to each side of the equation. 9 + 3y = -3y + 3y Combine like terms: -3y + 3y = 0 9 + 3y = 0 Add '-9' to each side of the equation. 9 + -9 + 3y = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3y = 0 + -9 3y = 0 + -9 Combine like terms: 0 + -9 = -9 3y = -9 Divide each side by '3'. y = -3 Simplifying y = -3
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