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Simplifying 17 + 2(15 + y) + -12 = 91 17 + (15 * 2 + y * 2) + -12 = 91 17 + (30 + 2y) + -12 = 91 Reorder the terms: 17 + 30 + -12 + 2y = 91 Combine like terms: 17 + 30 = 47 47 + -12 + 2y = 91 Combine like terms: 47 + -12 = 35 35 + 2y = 91 Solving 35 + 2y = 91 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + 2y = 91 + -35 Combine like terms: 35 + -35 = 0 0 + 2y = 91 + -35 2y = 91 + -35 Combine like terms: 91 + -35 = 56 2y = 56 Divide each side by '2'. y = 28 Simplifying y = 28
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