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Simplifying 3y + 7 + -1y = 21 Reorder the terms: 7 + 3y + -1y = 21 Combine like terms: 3y + -1y = 2y 7 + 2y = 21 Solving 7 + 2y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2y = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 2y = 21 + -7 2y = 21 + -7 Combine like terms: 21 + -7 = 14 2y = 14 Divide each side by '2'. y = 7 Simplifying y = 7
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