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Simplifying 21 = -4 + 9(y + 8) Reorder the terms: 21 = -4 + 9(8 + y) 21 = -4 + (8 * 9 + y * 9) 21 = -4 + (72 + 9y) Combine like terms: -4 + 72 = 68 21 = 68 + 9y Solving 21 = 68 + 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 21 + -9y = 68 + 9y + -9y Combine like terms: 9y + -9y = 0 21 + -9y = 68 + 0 21 + -9y = 68 Add '-21' to each side of the equation. 21 + -21 + -9y = 68 + -21 Combine like terms: 21 + -21 = 0 0 + -9y = 68 + -21 -9y = 68 + -21 Combine like terms: 68 + -21 = 47 -9y = 47 Divide each side by '-9'. y = -5.222222222 Simplifying y = -5.222222222
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