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Simplifying 3(y + 5) = 21 + y Reorder the terms: 3(5 + y) = 21 + y (5 * 3 + y * 3) = 21 + y (15 + 3y) = 21 + y Solving 15 + 3y = 21 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 15 + 3y + -1y = 21 + y + -1y Combine like terms: 3y + -1y = 2y 15 + 2y = 21 + y + -1y Combine like terms: y + -1y = 0 15 + 2y = 21 + 0 15 + 2y = 21 Add '-15' to each side of the equation. 15 + -15 + 2y = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 2y = 21 + -15 2y = 21 + -15 Combine like terms: 21 + -15 = 6 2y = 6 Divide each side by '2'. y = 3 Simplifying y = 3
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