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Simplifying 2y + 1 = 21 + -3y Reorder the terms: 1 + 2y = 21 + -3y Solving 1 + 2y = 21 + -3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3y' to each side of the equation. 1 + 2y + 3y = 21 + -3y + 3y Combine like terms: 2y + 3y = 5y 1 + 5y = 21 + -3y + 3y Combine like terms: -3y + 3y = 0 1 + 5y = 21 + 0 1 + 5y = 21 Add '-1' to each side of the equation. 1 + -1 + 5y = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 5y = 21 + -1 5y = 21 + -1 Combine like terms: 21 + -1 = 20 5y = 20 Divide each side by '5'. y = 4 Simplifying y = 4
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