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Simplifying 2y + 21 + y = 90 Reorder the terms: 21 + 2y + y = 90 Combine like terms: 2y + y = 3y 21 + 3y = 90 Solving 21 + 3y = 90 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3y = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 3y = 90 + -21 3y = 90 + -21 Combine like terms: 90 + -21 = 69 3y = 69 Divide each side by '3'. y = 23 Simplifying y = 23
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