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