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Simplifying 21 + -1y + 4 = 30 + -6y Reorder the terms: 21 + 4 + -1y = 30 + -6y Combine like terms: 21 + 4 = 25 25 + -1y = 30 + -6y Solving 25 + -1y = 30 + -6y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6y' to each side of the equation. 25 + -1y + 6y = 30 + -6y + 6y Combine like terms: -1y + 6y = 5y 25 + 5y = 30 + -6y + 6y Combine like terms: -6y + 6y = 0 25 + 5y = 30 + 0 25 + 5y = 30 Add '-25' to each side of the equation. 25 + -25 + 5y = 30 + -25 Combine like terms: 25 + -25 = 0 0 + 5y = 30 + -25 5y = 30 + -25 Combine like terms: 30 + -25 = 5 5y = 5 Divide each side by '5'. y = 1 Simplifying y = 1
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