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Simplifying 9y = (7y + 21) Reorder the terms: 9y = (21 + 7y) Remove parenthesis around (21 + 7y) 9y = 21 + 7y Solving 9y = 21 + 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. 9y + -7y = 21 + 7y + -7y Combine like terms: 9y + -7y = 2y 2y = 21 + 7y + -7y Combine like terms: 7y + -7y = 0 2y = 21 + 0 2y = 21 Divide each side by '2'. y = 10.5 Simplifying y = 10.5
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