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Simplifying 2y + y + 21 = 42 Reorder the terms: 21 + 2y + y = 42 Combine like terms: 2y + y = 3y 21 + 3y = 42 Solving 21 + 3y = 42 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 = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 3y = 42 + -21 3y = 42 + -21 Combine like terms: 42 + -21 = 21 3y = 21 Divide each side by '3'. y = 7 Simplifying y = 7
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