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Simplifying 7y + -3y = y + 21 Combine like terms: 7y + -3y = 4y 4y = y + 21 Reorder the terms: 4y = 21 + y Solving 4y = 21 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 4y + -1y = 21 + y + -1y Combine like terms: 4y + -1y = 3y 3y = 21 + y + -1y Combine like terms: y + -1y = 0 3y = 21 + 0 3y = 21 Divide each side by '3'. y = 7 Simplifying y = 7
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