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Simplifying 3 + y + y = 21 Combine like terms: y + y = 2y 3 + 2y = 21 Solving 3 + 2y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2y = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2y = 21 + -3 2y = 21 + -3 Combine like terms: 21 + -3 = 18 2y = 18 Divide each side by '2'. y = 9 Simplifying y = 9
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