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Simplifying 15 + y = 21 + -1y Solving 15 + y = 21 + -1y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add 'y' to each side of the equation. 15 + y + y = 21 + -1y + y Combine like terms: y + y = 2y 15 + 2y = 21 + -1y + y Combine like terms: -1y + y = 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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