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