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Simplifying 21 = -5y + 3(y + 3) Reorder the terms: 21 = -5y + 3(3 + y) 21 = -5y + (3 * 3 + y * 3) 21 = -5y + (9 + 3y) Reorder the terms: 21 = 9 + -5y + 3y Combine like terms: -5y + 3y = -2y 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 = -12 2y = -12 Divide each side by '2'. y = -6 Simplifying y = -6
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